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Loans and allowance for credit losses - Credit Quality of Loan Portfolio by Year of Origination (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 $ 2,357,250 $ 1,517,481
2020-2019 960,345 1,246,239
2019-2018 859,299 853,371
2018-2017 606,741 696,494
2017-2016 439,292 648,821
Prior 1,134,004 900,082
Revolving Loans Amortized Cost Basis 1,247,731 1,220,471
Total 7,604,662 7,082,959
Pass    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 2,353,285 1,510,393
2020-2019 951,510 1,228,017
2019-2018 839,635 813,323
2018-2017 564,491 660,160
2017-2016 424,423 628,209
Prior 1,082,325 836,930
Revolving Loans Amortized Cost Basis 1,220,476 1,171,352
Total 7,436,145 6,848,384
Special Mention    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 877 3,371
2020-2019 1,616 7,791
2019-2018 7,084 16,478
2018-2017 7,967 19,060
2017-2016 3,262 9,199
Prior 8,347 18,733
Revolving Loans Amortized Cost Basis 12,923 27,720
Total 42,076 102,352
Classified    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 3,088 3,717
2020-2019 7,219 10,431
2019-2018 12,580 23,570
2018-2017 34,283 17,274
2017-2016 11,607 11,413
Prior 43,332 44,419
Revolving Loans Amortized Cost Basis 14,332 21,399
Total 126,441 132,223
Commercial and industrial    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 274,229 341,806
2020-2019 97,679 189,148
2019-2018 144,263 82,337
2018-2017 55,883 64,787
2017-2016 37,370 45,070
Prior 64,964 46,542
Revolving Loans Amortized Cost Basis 616,177 576,432
Total 1,290,565 1,346,122
Commercial and industrial | Pass    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 273,232 339,074
2020-2019 95,279 185,636
2019-2018 140,938 70,549
2018-2017 52,162 59,917
2017-2016 33,997 37,573
Prior 57,020 42,685
Revolving Loans Amortized Cost Basis 596,667 540,960
Total 1,249,295 1,276,394
Commercial and industrial | Special Mention    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 79 231
2020-2019 9 824
2019-2018 949 561
2018-2017 632 445
2017-2016 3 915
Prior 1,519 2,580
Revolving Loans Amortized Cost Basis 12,367 24,826
Total 15,558 30,382
Commercial and industrial | Classified    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 918 2,501
2020-2019 2,391 2,688
2019-2018 2,376 11,227
2018-2017 3,089 4,425
2017-2016 3,370 6,582
Prior 6,425 1,277
Revolving Loans Amortized Cost Basis 7,143 10,646
Total 25,712 39,346
Construction    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 677,320 462,757
2020-2019 281,012 393,683
2019-2018 138,690 91,865
2018-2017 26,798 54,304
2017-2016 16,524 41,636
Prior 69,939 65,971
Revolving Loans Amortized Cost Basis 117,376 112,004
Total 1,327,659 1,222,220
Construction | Pass    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 677,258 461,715
2020-2019 280,828 390,443
2019-2018 135,768 86,490
2018-2017 23,916 52,942
2017-2016 15,313 40,907
Prior 67,818 62,890
Revolving Loans Amortized Cost Basis 117,176 112,004
Total 1,318,077 1,207,391
Construction | Special Mention    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 62 469
2020-2019 184 1,485
2019-2018 0 2,197
2018-2017 0 1,221
2017-2016 1,208 729
Prior 1,384 13
Revolving Loans Amortized Cost Basis 0 0
Total 2,838 6,114
Construction | Classified    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 0 573
2020-2019 0 1,755
2019-2018 2,922 3,178
2018-2017 2,882 141
2017-2016 3 0
Prior 737 3,068
Revolving Loans Amortized Cost Basis 200 0
Total 6,744 8,715
Residential real estate | 1-to-4 family mortgage    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 522,765 284,978
2020-2019 208,425 179,968
2019-2018 122,752 169,514
2018-2017 102,592 163,957
2017-2016 110,852 115,537
Prior 203,081 175,316
Revolving Loans Amortized Cost Basis 0 0
Total 1,270,467 1,089,270
Residential real estate | 1-to-4 family mortgage | Pass    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 519,946 283,107
2020-2019 202,299 176,711
2019-2018 119,915 164,499
2018-2017 99,479 157,731
2017-2016 107,214 111,194
Prior 194,088 162,051
Revolving Loans Amortized Cost Basis 0 0
Total 1,242,941 1,055,293
Residential real estate | 1-to-4 family mortgage | Special Mention    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 736 1,423
2020-2019 1,423 1,829
2019-2018 877 1,209
2018-2017 406 753
2017-2016 1,166 721
Prior 1,609 3,865
Revolving Loans Amortized Cost Basis 0 0
Total 6,217 9,800
Residential real estate | 1-to-4 family mortgage | Classified    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 2,083 448
2020-2019 4,703 1,428
2019-2018 1,960 3,806
2018-2017 2,707 5,473
2017-2016 2,472 3,622
Prior 7,384 9,400
Revolving Loans Amortized Cost Basis 0 0
Total 21,309 24,177
Residential real estate | Residential line of credit    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 0 0
2020-2019 0 0
2019-2018 0 0
2018-2017 0 0
2017-2016 0 0
Prior 0 0
Revolving Loans Amortized Cost Basis 383,039 408,211
Total 383,039 408,211
Residential real estate | Residential line of credit | Pass    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 0 0
2020-2019 0 0
2019-2018 0 0
2018-2017 0 0
2017-2016 0 0
Prior 0 0
Revolving Loans Amortized Cost Basis 377,989 400,206
Total 377,989 400,206
Residential real estate | Residential line of credit | Special Mention    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 0 0
2020-2019 0 0
2019-2018 0 0
2018-2017 0 0
2017-2016 0 0
Prior 0 0
Revolving Loans Amortized Cost Basis 343 2,653
Total 343 2,653
Residential real estate | Residential line of credit | Classified    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 0 0
2020-2019 0 0
2019-2018 0 0
2018-2017 0 0
2017-2016 0 0
Prior 0 0
Revolving Loans Amortized Cost Basis 4,707 5,352
Total 4,707 5,352
Residential real estate | Multi-family mortgage    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 166,576 29,006
2020-2019 32,242 13,446
2019-2018 64,345 11,843
2018-2017 7,124 46,561
2017-2016 5,602 28,330
Prior 39,771 35,396
Revolving Loans Amortized Cost Basis 10,891 11,094
Total 326,551 175,676
Residential real estate | Multi-family mortgage | Pass    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 166,576 29,006
2020-2019 32,242 13,446
2019-2018 64,345 11,843
2018-2017 7,124 46,561
2017-2016 5,602 28,330
Prior 38,526 35,339
Revolving Loans Amortized Cost Basis 10,891 11,094
Total 325,306 175,619
Residential real estate | Multi-family mortgage | Special Mention    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 0 0
2020-2019 0 0
2019-2018 0 0
2018-2017 0 0
2017-2016 0 0
Prior 0 0
Revolving Loans Amortized Cost Basis 0 0
Total 0 0
Residential real estate | Multi-family mortgage | Classified    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 0 0
2020-2019 0 0
2019-2018 0 0
2018-2017 0 0
2017-2016 0 0
Prior 1,245 57
Revolving Loans Amortized Cost Basis 0 0
Total 1,245 57
Commercial real estate | Owner occupied    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 170,773 141,915
2020-2019 131,471 182,641
2019-2018 178,861 104,251
2018-2017 88,007 116,906
2017-2016 74,119 82,914
Prior 249,169 237,800
Revolving Loans Amortized Cost Basis 59,182 58,414
Total 951,582 924,841
Commercial real estate | Owner occupied | Pass    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 170,773 140,904
2020-2019 131,471 179,500
2019-2018 174,257 97,577
2018-2017 83,698 94,659
2017-2016 69,939 76,539
Prior 236,998 224,108
Revolving Loans Amortized Cost Basis 57,123 53,451
Total 924,259 866,738
Commercial real estate | Owner occupied | Special Mention    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 0 967
2020-2019 0 1,356
2019-2018 1,502 4,251
2018-2017 3,541 16,173
2017-2016 885 6,101
Prior 2,555 2,466
Revolving Loans Amortized Cost Basis 213 230
Total 8,696 31,544
Commercial real estate | Owner occupied | Classified    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 0 44
2020-2019 0 1,785
2019-2018 3,102 2,423
2018-2017 768 6,074
2017-2016 3,295 274
Prior 9,616 11,226
Revolving Loans Amortized Cost Basis 1,846 4,733
Total 18,627 26,559
Commercial real estate | Non-owner occupied    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 462,478 166,962
2020-2019 154,048 233,152
2019-2018 171,562 350,814
2018-2017 292,092 221,149
2017-2016 172,108 290,370
Prior 431,336 297,712
Revolving Loans Amortized Cost Basis 46,541 38,820
Total 1,730,165 1,598,979
Commercial real estate | Non-owner occupied | Pass    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 462,478 166,962
2020-2019 154,048 229,442
2019-2018 165,917 342,640
2018-2017 264,855 221,149
2017-2016 170,602 290,163
Prior 414,859 272,184
Revolving Loans Amortized Cost Basis 46,541 38,820
Total 1,679,300 1,561,360
Commercial real estate | Non-owner occupied | Special Mention    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 0 0
2020-2019 0 1,500
2019-2018 3,747 6,672
2018-2017 3,388 0
2017-2016 0 207
Prior 969 8,445
Revolving Loans Amortized Cost Basis 0 0
Total 8,104 16,824
Commercial real estate | Non-owner occupied | Classified    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 0 0
2020-2019 0 2,210
2019-2018 1,898 1,502
2018-2017 23,849 0
2017-2016 1,506 0
Prior 15,508 17,083
Revolving Loans Amortized Cost Basis 0 0
Total 42,761 20,795
Consumer and other    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 83,109 90,057
2020-2019 55,468 54,201
2019-2018 38,826 42,747
2018-2017 34,245 28,830
2017-2016 22,717 44,964
Prior 75,744 41,345
Revolving Loans Amortized Cost Basis 14,525 15,496
Total 324,634 317,640
Consumer and other | Pass    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 83,022 89,625
2020-2019 55,343 52,839
2019-2018 38,495 39,725
2018-2017 33,257 27,201
2017-2016 21,756 43,503
Prior 73,016 37,673
Revolving Loans Amortized Cost Basis 14,089 14,817
Total 318,978 305,383
Consumer and other | Special Mention    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 0 281
2020-2019 0 797
2019-2018 9 1,588
2018-2017 0 468
2017-2016 0 526
Prior 311 1,364
Revolving Loans Amortized Cost Basis 0 11
Total 320 5,035
Consumer and other | Classified    
Financing Receivable, Allowance for Credit Loss [Line Items]    
2021-2020 87 151
2020-2019 125 565
2019-2018 322 1,434
2018-2017 988 1,161
2017-2016 961 935
Prior 2,417 2,308
Revolving Loans Amortized Cost Basis 436 668
Total $ 5,336 $ 7,222