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Loans and Allowance for Credit Losses - Risk category of loans by class of loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]    
Prior $ 1,933,367 $ 1,628,363
Four years before current fiscal year 978,159 723,156
Three before current fiscal year 1,344,420 1,227,254
Two years before current fiscal year 1,050,770 1,549,098
Fiscal year before current fiscal year 910,312 1,193,110
Current fiscal year 633,835 1,439,231
Total 6,850,863 7,760,212
Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 433,200 378,211
Four years before current fiscal year 209,924 124,696
Three before current fiscal year 231,513 279,475
Two years before current fiscal year 136,499 239,474
Fiscal year before current fiscal year 111,062 178,334
Current fiscal year 167,017 237,243
Total 1,289,215 1,437,433
Commercial | Pass    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 407,791 323,660
Four years before current fiscal year 190,479 111,886
Three before current fiscal year 211,058 249,541
Two years before current fiscal year 129,448 211,551
Fiscal year before current fiscal year 103,135 164,166
Current fiscal year 164,058 227,095
Total 1,205,969 1,287,899
Commercial | Watch    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 14,162 31,903
Four years before current fiscal year 8,798 5,315
Three before current fiscal year 17,857 19,145
Two years before current fiscal year 6,721 21,013
Fiscal year before current fiscal year 7,927 7,740
Current fiscal year 2,959 7,979
Total 58,424 93,095
Commercial | Special Mention    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 980 4,969
Four years before current fiscal year 9,952 1,692
Three before current fiscal year 381 8,969
Two years before current fiscal year 98 3,385
Fiscal year before current fiscal year   5,599
Current fiscal year   2,169
Total 11,411 26,783
Commercial | Substandard    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 10,267 17,679
Four years before current fiscal year 695 5,803
Three before current fiscal year 2,217 1,820
Two years before current fiscal year 232 3,525
Fiscal year before current fiscal year   829
Total 13,411 29,656
PPP loans    
Loans and Leases Receivable Disclosure [Line Items]    
Fiscal year before current fiscal year 32,381  
Current fiscal year 34,930 454,771
Total 67,311 454,771
PPP loans | Pass    
Loans and Leases Receivable Disclosure [Line Items]    
Fiscal year before current fiscal year 32,381  
Current fiscal year 34,930 454,771
Total 67,311 454,771
Income producing - commercial real estate    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 938,120 772,050
Four years before current fiscal year 361,737 411,658
Three before current fiscal year 661,483 494,245
Two years before current fiscal year 615,666 717,011
Fiscal year before current fiscal year 453,839 745,454
Current fiscal year 306,458 546,582
Total 3,337,303 3,687,000
Income producing - commercial real estate | Pass    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 708,822 560,915
Four years before current fiscal year 287,984 347,946
Three before current fiscal year 610,727 397,953
Two years before current fiscal year 514,416 622,276
Fiscal year before current fiscal year 418,980 643,388
Current fiscal year 306,458 512,387
Total 2,847,387 3,084,865
Income producing - commercial real estate | Watch    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 66,069 152,367
Four years before current fiscal year 73,753 62,912
Three before current fiscal year   91,636
Two years before current fiscal year 43,739 89,852
Fiscal year before current fiscal year 34,859 44,555
Current fiscal year   34,195
Total 218,420 475,517
Income producing - commercial real estate | Special Mention    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 101,687 213
Three before current fiscal year 42,244  
Two years before current fiscal year 51,969  
Fiscal year before current fiscal year   51,969
Total 195,900 52,182
Income producing - commercial real estate | Substandard    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 61,542 58,555
Four years before current fiscal year   800
Three before current fiscal year 8,512 4,656
Two years before current fiscal year 5,542 4,883
Fiscal year before current fiscal year   5,542
Total 75,596 74,436
Owner occupied - commercial real estate    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 431,415 388,031
Four years before current fiscal year 135,526 106,067
Three before current fiscal year 224,123 116,544
Two years before current fiscal year 101,370 232,140
Fiscal year before current fiscal year 44,465 104,424
Current fiscal year 40,718 50,488
Total 977,617 997,694
Owner occupied - commercial real estate | Pass    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 383,943 343,371
Four years before current fiscal year 132,292 100,272
Three before current fiscal year 131,088 111,996
Two years before current fiscal year 71,524 136,644
Fiscal year before current fiscal year 44,465 59,681
Current fiscal year 40,718 49,584
Total 804,030 801,548
Owner occupied - commercial real estate | Watch    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 23,960 16,014
Four years before current fiscal year 3,234 5,011
Three before current fiscal year 93,035 2,640
Two years before current fiscal year 23,968 10,338
Fiscal year before current fiscal year   15,501
Total 144,197 49,504
Owner occupied - commercial real estate | Special Mention    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 0 418
Two years before current fiscal year 2,133 83,110
Fiscal year before current fiscal year   19,091
Total 2,133 102,619
Owner occupied - commercial real estate | Substandard    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 23,512 28,228
Four years before current fiscal year   784
Three before current fiscal year   1,908
Two years before current fiscal year 3,745 2,048
Fiscal year before current fiscal year   10,151
Current fiscal year   904
Total 27,257 44,023
Real estate mortgage - residential    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 20,010 19,504
Four years before current fiscal year 7,284 5,090
Three before current fiscal year 13,409 10,199
Two years before current fiscal year 16,787 13,474
Fiscal year before current fiscal year 3,999 18,209
Current fiscal year 14,770 10,116
Total 76,259 76,592
Real estate mortgage - residential | Pass    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 15,047 16,310
Four years before current fiscal year 7,284 2,693
Three before current fiscal year 13,409 10,199
Two years before current fiscal year 16,703 12,746
Fiscal year before current fiscal year 3,999 18,209
Current fiscal year 14,770 10,116
Total 71,212 70,273
Real estate mortgage - residential | Watch    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 3,265 1,996
Four years before current fiscal year 0 699
Two years before current fiscal year   728
Total 3,265 3,423
Real estate mortgage - residential | Substandard    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 1,698 1,198
Four years before current fiscal year   1,698
Two years before current fiscal year 84  
Total 1,782 2,896
Construction - commercial and residential    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 60,636 22,231
Four years before current fiscal year 204,705 60,486
Three before current fiscal year 185,229 309,745
Two years before current fiscal year 131,804 303,823
Fiscal year before current fiscal year 181,470 105,679
Current fiscal year 60,289 71,297
Total 824,133 873,261
Construction - commercial and residential | Pass    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 60,130 21,290
Four years before current fiscal year 160,792 60,486
Three before current fiscal year 185,229 266,788
Two years before current fiscal year 128,722 297,480
Fiscal year before current fiscal year 181,470 105,679
Current fiscal year 60,289 71,297
Total 776,632 823,020
Construction - commercial and residential | Watch    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 506 929
Four years before current fiscal year 43,913  
Three before current fiscal year   42,751
Two years before current fiscal year 3,082 3,448
Total 47,501 47,128
Construction - commercial and residential | Special Mention    
Loans and Leases Receivable Disclosure [Line Items]    
Prior   12
Two years before current fiscal year   2,895
Total   2,907
Construction - commercial and residential | Substandard    
Loans and Leases Receivable Disclosure [Line Items]    
Three before current fiscal year   206
Total 0 206
Construction - C&I (owner occupied)    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 22,207 11,975
Four years before current fiscal year 53,127 10,476
Three before current fiscal year 26,835 8,755
Two years before current fiscal year 45,921 35,275
Fiscal year before current fiscal year 73,629 36,645
Current fiscal year 647 55,779
Total 222,366 158,905
Construction - C&I (owner occupied) | Pass    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 21,522 8,278
Four years before current fiscal year 52,731 10,476
Three before current fiscal year 23,581 6,637
Two years before current fiscal year 30,809 30,340
Fiscal year before current fiscal year 57,911 22,209
Current fiscal year 647 40,101
Total 187,201 118,041
Construction - C&I (owner occupied) | Watch    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 685 3,573
Four years before current fiscal year 396  
Three before current fiscal year 3,254 2,118
Two years before current fiscal year 15,112 4,935
Fiscal year before current fiscal year 15,718  
Total 35,165 10,626
Construction - C&I (owner occupied) | Special Mention    
Loans and Leases Receivable Disclosure [Line Items]    
Prior   124
Fiscal year before current fiscal year   14,436
Current fiscal year   15,678
Total   30,238
Construction - C&I (owner occupied) | Substandard    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 0  
Total 0  
Home equity    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 26,837 35,425
Four years before current fiscal year 5,832 4,493
Three before current fiscal year 1,782 8,227
Two years before current fiscal year 2,690 7,827
Fiscal year before current fiscal year 9,443 4,271
Current fiscal year 8,943 12,924
Total 55,527 73,167
Home equity | Pass    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 25,402 33,226
Four years before current fiscal year 5,832 4,493
Three before current fiscal year 1,782 8,227
Two years before current fiscal year 2,644 7,827
Fiscal year before current fiscal year 9,443 4,224
Current fiscal year 8,943 12,924
Total 54,046 70,921
Home equity | Watch    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 879 1,596
Total 879 1,596
Home equity | Substandard    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 556 603
Two years before current fiscal year 46  
Fiscal year before current fiscal year   47
Total 602 650
Other consumer    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 942 936
Four years before current fiscal year 24 190
Three before current fiscal year 46 64
Two years before current fiscal year 33 74
Fiscal year before current fiscal year 24 94
Current fiscal year 63 31
Total 1,132 1,389
Other consumer | Pass    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 936 929
Four years before current fiscal year 24 190
Three before current fiscal year 46 64
Two years before current fiscal year 33 74
Fiscal year before current fiscal year 24 94
Current fiscal year 63 31
Total 1,126 1,382
Other consumer | Substandard    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 6 7
Total $ 6 $ 7