XML 51 R42.htm IDEA: XBRL DOCUMENT
v3.23.3

Loans and Allowance for Credit Losses on Loans - Schedule of Loans by Risk Grade and Origination Year (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one | $ 122,716 |  | $ 122,716 |  | $ 338,104
Financing receivable, originated, year two | 321,023 |  | 321,023 |  | 336,584
Financing receivable, originated, year three | 323,374 |  | 323,374 |  | 280,304
Financing receivable, originated, year four | 269,265 |  | 269,265 |  | 269,247
Financing receivable, originated, year five | 248,714 |  | 248,714 |  | 198,510
Prior | 638,991 |  | 638,991 |  | 496,053
Revolving Loans Amortized Cost | 162,859 |  | 162,859 |  | 173,744
Total | 2,086,942 |  | 2,086,942 |  | 2,092,546
Gross current period charge-offs, originated, year one |  |  | (7) |  |
Gross current period charge-offs, originated, year two |  |  | (5) |  |
Gross current period charge-offs, originated, year three |  |  | 0 |  |
Gross current period charge-offs, originated, year four |  |  | (4) |  |
Gross current period charge-offs, originated, year five |  |  | (3) |  |
Gross current period charge-offs, originated, prior |  |  | (4) |  |
Gross current period charge-offs, originated, revolving loans amortized cost |  |  | (6) |  |
Gross current period charge-offs, originated, total | (6) | $ (10) | (29) | $ (32) |
Pass and Watch |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one | 121,269 |  | 121,269 |  | 337,829
Financing receivable, originated, year two | 311,141 |  | 311,141 |  | 316,949
Financing receivable, originated, year three | 295,841 |  | 295,841 |  | 266,856
Financing receivable, originated, year four | 255,665 |  | 255,665 |  | 261,577
Financing receivable, originated, year five | 227,103 |  | 227,103 |  | 188,741
Prior | 573,253 |  | 573,253 |  | 459,651
Revolving Loans Amortized Cost | 150,609 |  | 150,609 |  | 172,627
Total | 1,934,881 |  | 1,934,881 |  | 2,004,230
Special Mention |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one | 1,447 |  | 1,447 |  | 275
Financing receivable, originated, year two | 7,349 |  | 7,349 |  | 17,371
Financing receivable, originated, year three | 25,324 |  | 25,324 |  | 12,097
Financing receivable, originated, year four | 12,682 |  | 12,682 |  | 6,510
Financing receivable, originated, year five | 17,777 |  | 17,777 |  | 9,769
Prior | 39,613 |  | 39,613 |  | 13,783
Revolving Loans Amortized Cost | 8,172 |  | 8,172 |  | 402
Total | 112,364 |  | 112,364 |  | 60,207
Substandard |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one | 0 |  | 0 |  | 0
Financing receivable, originated, year two | 2,533 |  | 2,533 |  | 2,264
Financing receivable, originated, year three | 2,209 |  | 2,209 |  | 1,252
Financing receivable, originated, year four | 918 |  | 918 |  | 1,160
Financing receivable, originated, year five | 3,834 |  | 3,834 |  | 0
Prior | 26,125 |  | 26,125 |  | 22,619
Revolving Loans Amortized Cost | 4,078 |  | 4,078 |  | 715
Total | 39,697 |  | 39,697 |  | 28,010
Doubtful |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one |  |  |  |  | 0
Financing receivable, originated, year two |  |  |  |  | 0
Financing receivable, originated, year three |  |  |  |  | 99
Financing receivable, originated, year four |  |  |  |  | 0
Financing receivable, originated, year five |  |  |  |  | 0
Prior |  |  |  |  | 0
Revolving Loans Amortized Cost |  |  |  |  | 0
Total |  |  |  |  | 99
Commercial loans | Commercial and industrial |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one | 32,023 |  | 32,023 |  | 15,624
Financing receivable, originated, year two | 9,508 |  | 9,508 |  | 6,679
Financing receivable, originated, year three | 3,360 |  | 3,360 |  | 8,855
Financing receivable, originated, year four | 5,562 |  | 5,562 |  | 22,254
Financing receivable, originated, year five | 17,909 |  | 17,909 |  | 9,198
Prior | 26,227 |  | 26,227 |  | 25,579
Revolving Loans Amortized Cost | 79,507 |  | 79,507 |  | 85,358
Total | 174,096 |  | 174,096 |  | 173,547
Gross current period charge-offs, originated, year one |  |  | 0 |  |
Gross current period charge-offs, originated, year two |  |  | 0 |  |
Gross current period charge-offs, originated, year three |  |  | 0 |  |
Gross current period charge-offs, originated, year four |  |  | 0 |  |
Gross current period charge-offs, originated, year five |  |  | (3) |  |
Gross current period charge-offs, originated, prior |  |  | (3) |  |
Gross current period charge-offs, originated, revolving loans amortized cost |  |  | (1) |  |
Gross current period charge-offs, originated, total | (4) | (9) | (7) | (9) |
Commercial loans | Commercial and industrial | Pass and Watch |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one | 31,632 |  | 31,632 |  | 15,349
Financing receivable, originated, year two | 9,235 |  | 9,235 |  | 6,679
Financing receivable, originated, year three | 3,360 |  | 3,360 |  | 7,603
Financing receivable, originated, year four | 4,644 |  | 4,644 |  | 19,982
Financing receivable, originated, year five | 16,222 |  | 16,222 |  | 5,362
Prior | 23,223 |  | 23,223 |  | 24,954
Revolving Loans Amortized Cost | 67,670 |  | 67,670 |  | 84,655
Total | 155,986 |  | 155,986 |  | 164,584
Commercial loans | Commercial and industrial | Special Mention |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one | 391 |  | 391 |  | 275
Financing receivable, originated, year two | 0 |  | 0 |  | 0
Financing receivable, originated, year three | 0 |  | 0 |  | 0
Financing receivable, originated, year four | 0 |  | 0 |  | 2,272
Financing receivable, originated, year five | 1,687 |  | 1,687 |  | 3,836
Prior | 269 |  | 269 |  | 0
Revolving Loans Amortized Cost | 8,172 |  | 8,172 |  | 402
Total | 10,519 |  | 10,519 |  | 6,785
Commercial loans | Commercial and industrial | Substandard |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one | 0 |  | 0 |  | 0
Financing receivable, originated, year two | 273 |  | 273 |  | 0
Financing receivable, originated, year three | 0 |  | 0 |  | 1,252
Financing receivable, originated, year four | 918 |  | 918 |  | 0
Financing receivable, originated, year five | 0 |  | 0 |  | 0
Prior | 2,735 |  | 2,735 |  | 625
Revolving Loans Amortized Cost | 3,665 |  | 3,665 |  | 301
Total | 7,591 |  | 7,591 |  | 2,178
Commercial real estate loans | Commercial owner-occupied |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one | 11,430 |  | 11,430 |  | 54,188
Financing receivable, originated, year two | 54,861 |  | 54,861 |  | 68,279
Financing receivable, originated, year three | 66,044 |  | 66,044 |  | 40,468
Financing receivable, originated, year four | 39,001 |  | 39,001 |  | 46,262
Financing receivable, originated, year five | 44,334 |  | 44,334 |  | 35,111
Prior | 130,637 |  | 130,637 |  | 110,569
Revolving Loans Amortized Cost | 0 |  | 0 |  | 0
Total | 346,307 |  | 346,307 |  | 354,877
Gross current period charge-offs, originated, total | 0 | 0 | 0 | 0 |
Commercial real estate loans | Commercial owner-occupied | Pass and Watch |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one | 10,374 |  | 10,374 |  | 54,188
Financing receivable, originated, year two | 48,054 |  | 48,054 |  | 52,080
Financing receivable, originated, year three | 50,265 |  | 50,265 |  | 40,369
Financing receivable, originated, year four | 38,176 |  | 38,176 |  | 44,798
Financing receivable, originated, year five | 40,211 |  | 40,211 |  | 29,856
Prior | 118,370 |  | 118,370 |  | 104,377
Revolving Loans Amortized Cost | 0 |  | 0 |  | 0
Total | 305,450 |  | 305,450 |  | 325,668
Commercial real estate loans | Commercial owner-occupied | Special Mention |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one | 1,056 |  | 1,056 |  | 0
Financing receivable, originated, year two | 4,547 |  | 4,547 |  | 16,199
Financing receivable, originated, year three | 15,779 |  | 15,779 |  | 0
Financing receivable, originated, year four | 825 |  | 825 |  | 304
Financing receivable, originated, year five | 289 |  | 289 |  | 5,255
Prior | 10,463 |  | 10,463 |  | 4,493
Revolving Loans Amortized Cost | 0 |  | 0 |  | 0
Total | 32,959 |  | 32,959 |  | 26,251
Commercial real estate loans | Commercial owner-occupied | Substandard |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one | 0 |  | 0 |  | 0
Financing receivable, originated, year two | 2,260 |  | 2,260 |  | 0
Financing receivable, originated, year three | 0 |  | 0 |  | 0
Financing receivable, originated, year four | 0 |  | 0 |  | 1,160
Financing receivable, originated, year five | 3,834 |  | 3,834 |  | 0
Prior | 1,804 |  | 1,804 |  | 1,699
Revolving Loans Amortized Cost | 0 |  | 0 |  | 0
Total | 7,898 |  | 7,898 |  | 2,859
Commercial real estate loans | Commercial owner-occupied | Doubtful |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one |  |  |  |  | 0
Financing receivable, originated, year two |  |  |  |  | 0
Financing receivable, originated, year three |  |  |  |  | 99
Financing receivable, originated, year four |  |  |  |  | 0
Financing receivable, originated, year five |  |  |  |  | 0
Prior |  |  |  |  | 0
Revolving Loans Amortized Cost |  |  |  |  | 0
Total |  |  |  |  | 99
Commercial real estate loans | Commercial non-owner occupied |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one | 30,200 |  | 30,200 |  | 177,822
Financing receivable, originated, year two | 177,129 |  | 177,129 |  | 214,664
Financing receivable, originated, year three | 210,096 |  | 210,096 |  | 167,375
Financing receivable, originated, year four | 164,175 |  | 164,175 |  | 164,604
Financing receivable, originated, year five | 159,913 |  | 159,913 |  | 129,844
Prior | 449,300 |  | 449,300 |  | 337,523
Revolving Loans Amortized Cost | 0 |  | 0 |  | 57
Total | 1,190,813 |  | 1,190,813 |  | 1,191,889
Gross current period charge-offs, originated, total | 0 | 0 |  |  |
Commercial real estate loans | Commercial non-owner occupied | Pass and Watch |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one | 30,200 |  | 30,200 |  | 177,822
Financing receivable, originated, year two | 174,327 |  | 174,327 |  | 211,228
Financing receivable, originated, year three | 198,342 |  | 198,342 |  | 155,278
Financing receivable, originated, year four | 152,318 |  | 152,318 |  | 160,670
Financing receivable, originated, year five | 144,112 |  | 144,112 |  | 129,166
Prior | 399,022 |  | 399,022 |  | 308,509
Revolving Loans Amortized Cost | 0 |  | 0 |  | 57
Total | 1,098,321 |  | 1,098,321 |  | 1,142,730
Commercial real estate loans | Commercial non-owner occupied | Special Mention |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one | 0 |  | 0 |  | 0
Financing receivable, originated, year two | 2,802 |  | 2,802 |  | 1,172
Financing receivable, originated, year three | 9,545 |  | 9,545 |  | 12,097
Financing receivable, originated, year four | 11,857 |  | 11,857 |  | 3,934
Financing receivable, originated, year five | 15,801 |  | 15,801 |  | 678
Prior | 28,881 |  | 28,881 |  | 9,290
Revolving Loans Amortized Cost | 0 |  | 0 |  | 0
Total | 68,886 |  | 68,886 |  | 27,171
Commercial real estate loans | Commercial non-owner occupied | Substandard |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one | 0 |  | 0 |  | 0
Financing receivable, originated, year two | 0 |  | 0 |  | 2,264
Financing receivable, originated, year three | 2,209 |  | 2,209 |  | 0
Financing receivable, originated, year four | 0 |  | 0 |  | 0
Financing receivable, originated, year five | 0 |  | 0 |  | 0
Prior | 21,397 |  | 21,397 |  | 19,724
Revolving Loans Amortized Cost | 0 |  | 0 |  | 0
Total | 23,606 |  | 23,606 |  | 21,988
Commercial real estate loans | Construction |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one | 17,173 |  | 17,173 |  | 49,262
Financing receivable, originated, year two | 44,236 |  | 44,236 |  | 19,393
Financing receivable, originated, year three | 18,827 |  | 18,827 |  | 28,861
Financing receivable, originated, year four | 29,069 |  | 29,069 |  | 7,745
Financing receivable, originated, year five | 0 |  | 0 |  | 9,112
Prior | 0 |  | 0 |  | 0
Revolving Loans Amortized Cost | 0 |  | 0 |  | 0
Total | 109,305 |  | 109,305 |  | 114,373
Gross current period charge-offs, originated, total | 0 | 0 | 0 | 0 |
Commercial real estate loans | Construction | Pass and Watch |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one | 17,173 |  | 17,173 |  | 49,262
Financing receivable, originated, year two | 44,236 |  | 44,236 |  | 19,393
Financing receivable, originated, year three | 18,827 |  | 18,827 |  | 28,861
Financing receivable, originated, year four | 29,069 |  | 29,069 |  | 7,745
Financing receivable, originated, year five | 0 |  | 0 |  | 9,112
Prior | 0 |  | 0 |  | 0
Revolving Loans Amortized Cost | 0 |  | 0 |  | 0
Total | 109,305 |  | 109,305 |  | 114,373
Residential loans | Home equity |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one | 0 |  | 0 |  | 0
Financing receivable, originated, year two | 0 |  | 0 |  | 0
Financing receivable, originated, year three | 0 |  | 0 |  | 0
Financing receivable, originated, year four | 0 |  | 0 |  | 0
Financing receivable, originated, year five | 0 |  | 0 |  | 0
Prior | 900 |  | 900 |  | 1,363
Revolving Loans Amortized Cost | 82,367 |  | 82,367 |  | 87,385
Total | 83,267 |  | 83,267 |  | 88,748
Gross current period charge-offs, originated, total | 0 | 0 | 0 | 0 |
Residential loans | Home equity | Pass and Watch |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one | 0 |  | 0 |  | 0
Financing receivable, originated, year two | 0 |  | 0 |  | 0
Financing receivable, originated, year three | 0 |  | 0 |  | 0
Financing receivable, originated, year four | 0 |  | 0 |  | 0
Financing receivable, originated, year five | 0 |  | 0 |  | 0
Prior | 711 |  | 711 |  | 883
Revolving Loans Amortized Cost | 81,954 |  | 81,954 |  | 86,971
Total | 82,665 |  | 82,665 |  | 87,854
Residential loans | Home equity | Substandard |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one | 0 |  | 0 |  | 0
Financing receivable, originated, year two | 0 |  | 0 |  | 0
Financing receivable, originated, year three | 0 |  | 0 |  | 0
Financing receivable, originated, year four | 0 |  | 0 |  | 0
Financing receivable, originated, year five | 0 |  | 0 |  | 0
Prior | 189 |  | 189 |  | 480
Revolving Loans Amortized Cost | 413 |  | 413 |  | 414
Total | 602 |  | 602 |  | 894
Residential loans | Other residential |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one | 13,224 |  | 13,224 |  | 21,154
Financing receivable, originated, year two | 20,218 |  | 20,218 |  | 14,547
Financing receivable, originated, year three | 13,673 |  | 13,673 |  | 29,018
Financing receivable, originated, year four | 26,487 |  | 26,487 |  | 21,890
Financing receivable, originated, year five | 21,075 |  | 21,075 |  | 11,064
Prior | 21,997 |  | 21,997 |  | 14,450
Revolving Loans Amortized Cost | 0 |  | 0 |  | 0
Total | 116,674 |  | 116,674 |  | 112,123
Gross current period charge-offs, originated, total | 0 | 0 | 0 | 0 |
Residential loans | Other residential | Pass and Watch |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one | 13,224 |  | 13,224 |  | 21,154
Financing receivable, originated, year two | 20,218 |  | 20,218 |  | 14,547
Financing receivable, originated, year three | 13,673 |  | 13,673 |  | 29,018
Financing receivable, originated, year four | 26,487 |  | 26,487 |  | 21,890
Financing receivable, originated, year five | 21,075 |  | 21,075 |  | 11,064
Prior | 21,997 |  | 21,997 |  | 14,450
Revolving Loans Amortized Cost | 0 |  | 0 |  | 0
Total | 116,674 |  | 116,674 |  | 112,123
Consumer loans | Installment and other consumer loans |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one | 18,666 |  | 18,666 |  | 20,054
Financing receivable, originated, year two | 15,071 |  | 15,071 |  | 13,022
Financing receivable, originated, year three | 11,374 |  | 11,374 |  | 5,727
Financing receivable, originated, year four | 4,971 |  | 4,971 |  | 6,492
Financing receivable, originated, year five | 5,483 |  | 5,483 |  | 4,181
Prior | 9,930 |  | 9,930 |  | 6,569
Revolving Loans Amortized Cost | 985 |  | 985 |  | 944
Total | 66,480 |  | 66,480 |  | 56,989
Gross current period charge-offs, originated, year one |  |  | (7) |  |
Gross current period charge-offs, originated, year two |  |  | (5) |  |
Gross current period charge-offs, originated, year three |  |  | 0 |  |
Gross current period charge-offs, originated, year four |  |  | (4) |  |
Gross current period charge-offs, originated, year five |  |  | 0 |  |
Gross current period charge-offs, originated, prior |  |  | (1) |  |
Gross current period charge-offs, originated, revolving loans amortized cost |  |  | (5) |  |
Gross current period charge-offs, originated, total | (2) | $ (1) | (22) | $ (23) |
Consumer loans | Installment and other consumer loans | Pass and Watch |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one | 18,666 |  | 18,666 |  | 20,054
Financing receivable, originated, year two | 15,071 |  | 15,071 |  | 13,022
Financing receivable, originated, year three | 11,374 |  | 11,374 |  | 5,727
Financing receivable, originated, year four | 4,971 |  | 4,971 |  | 6,492
Financing receivable, originated, year five | 5,483 |  | 5,483 |  | 4,181
Prior | 9,930 |  | 9,930 |  | 6,478
Revolving Loans Amortized Cost | 985 |  | 985 |  | 944
Total | $ 66,480 |  | $ 66,480 |  | 56,898
Consumer loans | Installment and other consumer loans | Substandard |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing receivable, originated, year one |  |  |  |  | 0
Financing receivable, originated, year two |  |  |  |  | 0
Financing receivable, originated, year three |  |  |  |  | 0
Financing receivable, originated, year four |  |  |  |  | 0
Financing receivable, originated, year five |  |  |  |  | 0
Prior |  |  |  |  | 91
Revolving Loans Amortized Cost |  |  |  |  | 0
Total |  |  |  |  | $ 91

X
- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated more than five years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable that can be withdrawn, repaid, and redrawn. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolving
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable that can be withdrawn, repaid, and redrawn. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated four years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated four years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated three years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated in current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated in current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated two years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated two years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest of financing receivable originated in fiscal year prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated in fiscal year before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-5 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_DoubtfulMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bmrc_CommercialAndIndustrialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bmrc_CommercialRealEstateLoanOwnerOccupiedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bmrc_CommercialRealEstateLoanNonOwnerOccupiedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bmrc_OtherResidentialLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bmrc_InstallmentAndOtherConsumerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |