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Loans and Allowance for Credit Losses - Risk category of loans by class of loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]    
Prior $ 2,206,329 $ 1,628,363
Four years before current fiscal year 1,080,923 723,156
Three before current fiscal year 1,468,114 1,227,254
Two years before current fiscal year 1,120,168 1,549,098
Fiscal year before current fiscal year 1,349,577 1,193,110
Current fiscal year 301,578 1,439,231
Total 7,526,689 7,760,212
Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 473,417 378,211
Four years before current fiscal year 246,458 124,696
Three before current fiscal year 242,570 279,475
Two years before current fiscal year 167,209 239,474
Fiscal year before current fiscal year 193,305 178,334
Current fiscal year 75,196 237,243
Total 1,398,155 1,437,433
Commercial | Pass    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 413,814 323,660
Four years before current fiscal year 221,839 111,886
Three before current fiscal year 217,567 249,541
Two years before current fiscal year 155,489 211,551
Fiscal year before current fiscal year 181,351 164,166
Current fiscal year 75,196 227,095
Total 1,265,256 1,287,899
Commercial | Watch    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 35,974 31,903
Four years before current fiscal year 23,444 5,315
Three before current fiscal year 19,089 19,145
Two years before current fiscal year 7,171 21,013
Fiscal year before current fiscal year 10,930 7,740
Current fiscal year   7,979
Total 96,608 93,095
Commercial | Special Mention    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 1,403 4,969
Four years before current fiscal year 0 1,692
Three before current fiscal year 3,366 8,969
Two years before current fiscal year 3,980 3,385
Fiscal year before current fiscal year 899 5,599
Current fiscal year   2,169
Total 9,648 26,783
Commercial | Substandard    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 22,226 17,679
Four years before current fiscal year 1,175 5,803
Three before current fiscal year 2,548 1,820
Two years before current fiscal year 569 3,525
Fiscal year before current fiscal year 125 829
Total 26,643 29,656
PPP loans    
Loans and Leases Receivable Disclosure [Line Items]    
Fiscal year before current fiscal year 387,765  
Current fiscal year 177,253 454,771
Total 565,018 454,771
PPP loans | Pass    
Loans and Leases Receivable Disclosure [Line Items]    
Fiscal year before current fiscal year 387,765  
Current fiscal year 177,253 454,771
Total 565,018 454,771
Income producing - commercial real estate    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 1,105,134 772,050
Four years before current fiscal year 380,426 411,658
Three before current fiscal year 717,019 494,245
Two years before current fiscal year 680,839 717,011
Fiscal year before current fiscal year 535,860 745,454
Current fiscal year 10,799 546,582
Total 3,430,077 3,687,000
Income producing - commercial real estate | Pass    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 822,220 560,915
Four years before current fiscal year 273,235 347,946
Three before current fiscal year 665,705 397,953
Two years before current fiscal year 579,001 622,276
Fiscal year before current fiscal year 501,066 643,388
Current fiscal year 10,799 512,387
Total 2,852,026 3,084,865
Income producing - commercial real estate | Watch    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 161,476 152,367
Four years before current fiscal year 107,191 62,912
Three before current fiscal year   91,636
Two years before current fiscal year 44,357 89,852
Fiscal year before current fiscal year 34,794 44,555
Current fiscal year   34,195
Total 347,818 475,517
Income producing - commercial real estate | Special Mention    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 57,448 213
Three before current fiscal year 42,810  
Two years before current fiscal year 51,939  
Fiscal year before current fiscal year   51,969
Total 152,197 52,182
Income producing - commercial real estate | Substandard    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 63,990 58,555
Four years before current fiscal year   800
Three before current fiscal year 8,504 4,656
Two years before current fiscal year 5,542 4,883
Fiscal year before current fiscal year   5,542
Total 78,036 74,436
Owner occupied - commercial real estate    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 472,783 388,031
Four years before current fiscal year 139,639 106,067
Three before current fiscal year 228,231 116,544
Two years before current fiscal year 103,588 232,140
Fiscal year before current fiscal year 50,211 104,424
Current fiscal year 18,005 50,488
Total 1,012,457 997,694
Owner occupied - commercial real estate | Pass    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 423,893 343,371
Four years before current fiscal year 134,465 100,272
Three before current fiscal year 132,647 111,996
Two years before current fiscal year 67,400 136,644
Fiscal year before current fiscal year 48,170 59,681
Current fiscal year 18,005 49,584
Total 824,580 801,548
Owner occupied - commercial real estate | Watch    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 21,916 16,014
Four years before current fiscal year 3,266 5,011
Three before current fiscal year 12,030 2,640
Two years before current fiscal year 7,175 10,338
Fiscal year before current fiscal year 2,041 15,501
Total 46,428 49,504
Owner occupied - commercial real estate | Special Mention    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 446 418
Three before current fiscal year 81,561  
Two years before current fiscal year 19,077 83,110
Fiscal year before current fiscal year   19,091
Total 101,084 102,619
Owner occupied - commercial real estate | Substandard    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 26,528 28,228
Four years before current fiscal year 1,908 784
Three before current fiscal year 1,993 1,908
Two years before current fiscal year 9,936 2,048
Fiscal year before current fiscal year   10,151
Current fiscal year   904
Total 40,365 44,023
Real estate mortgage - residential    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 23,205 19,504
Four years before current fiscal year 10,173 5,090
Three before current fiscal year 13,445 10,199
Two years before current fiscal year 17,637 13,474
Fiscal year before current fiscal year 5,565 18,209
Current fiscal year 1,184 10,116
Total 71,209 76,592
Real estate mortgage - residential | Pass    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 20,699 16,310
Four years before current fiscal year 10,173 2,693
Three before current fiscal year 13,445 10,199
Two years before current fiscal year 17,637 12,746
Fiscal year before current fiscal year 5,565 18,209
Current fiscal year 1,184 10,116
Total 68,703 70,273
Real estate mortgage - residential | Watch    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 605 1,996
Four years before current fiscal year 0 699
Two years before current fiscal year   728
Total 605 3,423
Real estate mortgage - residential | Substandard    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 1,901 1,198
Four years before current fiscal year   1,698
Total 1,901 2,896
Construction - commercial and residential    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 73,382 22,231
Four years before current fiscal year 289,527 60,486
Three before current fiscal year 235,378 309,745
Two years before current fiscal year 108,352 303,823
Fiscal year before current fiscal year 107,338 105,679
Current fiscal year 15,504 71,297
Total 829,481 873,261
Construction - commercial and residential | Pass    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 73,112 21,290
Four years before current fiscal year 233,218 60,486
Three before current fiscal year 230,716 266,788
Two years before current fiscal year 108,156 297,480
Fiscal year before current fiscal year 107,338 105,679
Current fiscal year 15,504 71,297
Total 768,044 823,020
Construction - commercial and residential | Watch    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 270 929
Four years before current fiscal year 56,309  
Three before current fiscal year 4,662 42,751
Two years before current fiscal year   3,448
Total 61,241 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
Two years before current fiscal year 196  
Total 196 206
Construction - C&I (owner occupied)    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 22,460 11,975
Four years before current fiscal year 7,792 10,476
Three before current fiscal year 24,752 8,755
Two years before current fiscal year 38,712 35,275
Fiscal year before current fiscal year 57,831 36,645
Current fiscal year 693 55,779
Total 152,240 158,905
Construction - C&I (owner occupied) | Pass    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 17,698 8,278
Four years before current fiscal year 7,380 10,476
Three before current fiscal year 19,358 6,637
Two years before current fiscal year 23,543 30,340
Fiscal year before current fiscal year 42,130 22,209
Current fiscal year 693 40,101
Total 110,802 118,041
Construction - C&I (owner occupied) | Watch    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 4,625 3,573
Four years before current fiscal year 412  
Three before current fiscal year 5,394 2,118
Two years before current fiscal year   4,935
Total 10,431 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 137  
Two years before current fiscal year 15,169  
Fiscal year before current fiscal year 15,701  
Total 31,007  
Home equity    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 35,352 35,425
Four years before current fiscal year 6,850 4,493
Three before current fiscal year 6,631 8,227
Two years before current fiscal year 3,749 7,827
Fiscal year before current fiscal year 11,675 4,271
Current fiscal year 2,910 12,924
Total 67,167 73,167
Home equity | Pass    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 33,548 33,226
Four years before current fiscal year 6,850 4,493
Three before current fiscal year 6,631 8,227
Two years before current fiscal year 3,704 7,827
Fiscal year before current fiscal year 11,675 4,224
Current fiscal year 2,910 12,924
Total 65,318 70,921
Home equity | Watch    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 1,436 1,596
Total 1,436 1,596
Home equity | Substandard    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 368 603
Two years before current fiscal year 45  
Fiscal year before current fiscal year   47
Total 413 650
Other consumer    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 596 936
Four years before current fiscal year 58 190
Three before current fiscal year 88 64
Two years before current fiscal year 82 74
Fiscal year before current fiscal year 27 94
Current fiscal year 34 31
Total 885 1,389
Other consumer | Pass    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 589 929
Four years before current fiscal year 58 190
Three before current fiscal year 88 64
Two years before current fiscal year 82 74
Fiscal year before current fiscal year 27 94
Current fiscal year 34 31
Total 878 1,382
Other consumer | Substandard    
Loans and Leases Receivable Disclosure [Line Items]    
Prior 7 7
Total $ 7 $ 7