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Loans and Allowance for Credit Losses - Risk category of loans by class of loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]      
Prior $ 1,628,363    
2016 723,156    
2017 1,227,254    
2018 1,549,098    
2019 1,193,110    
2020 1,439,231    
Net loans 7,760,212   $ 7,545,748
Pass      
Loans and Leases Receivable Disclosure [Line Items]      
Net loans     7,356,769
Watch      
Loans and Leases Receivable Disclosure [Line Items]      
Net loans     109,313
Special Mention      
Loans and Leases Receivable Disclosure [Line Items]      
Net loans     11,460
Substandard      
Loans and Leases Receivable Disclosure [Line Items]      
Net loans     68,206
Commercial      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 378,211    
2016 124,696    
2017 279,475    
2018 239,474    
2019 178,334    
2020 237,243    
Net loans 1,437,433 $ 1,545,906 1,545,906
Commercial | Pass      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 323,660    
2016 111,886    
2017 249,541    
2018 211,551    
2019 164,166    
2020 227,095    
Net loans 1,287,899   1,470,636
Commercial | Watch      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 31,903    
2016 5,315    
2017 19,145    
2018 21,013    
2019 7,740    
2020 7,979    
Net loans 93,095   38,522
Commercial | Special Mention      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 4,969    
2016 1,692    
2017 8,969    
2018 3,385    
2019 5,599    
2020 2,169    
Net loans 26,783   11,460
Commercial | Substandard      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 17,679    
2016 5,803    
2017 1,820    
2018 3,525    
2019 829    
Net loans 29,656   25,288
PPP loans      
Loans and Leases Receivable Disclosure [Line Items]      
2020 454,771    
Net loans 454,771    
PPP loans | Pass      
Loans and Leases Receivable Disclosure [Line Items]      
2020 454,771    
Net loans 454,771    
Income producing - commercial real estate      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 772,050    
2016 411,658    
2017 494,245    
2018 717,011    
2019 745,454    
2020 546,582    
Net loans 3,687,000 3,702,747 3,702,747
Income producing - commercial real estate | Pass      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 560,915    
2016 347,946    
2017 397,953    
2018 622,276    
2019 643,388    
2020 512,387    
Net loans 3,084,865   3,667,585
Income producing - commercial real estate | Watch      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 152,367    
2016 62,912    
2017 91,636    
2018 89,852    
2019 44,555    
2020 34,195    
Net loans 475,517   16,069
Income producing - commercial real estate | Special Mention      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 213    
2016 0    
2017 0    
2018 0    
2019 51,969    
Net loans 52,182    
Income producing - commercial real estate | Substandard      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 58,555    
2016 800    
2017 4,656    
2018 4,883    
2019 5,542    
Net loans 74,436   19,093
Owner occupied - commercial real estate      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 388,031    
2016 106,067    
2017 116,544    
2018 232,140    
2019 104,424    
2020 50,488    
Net loans 997,694 985,409 985,409
Owner occupied - commercial real estate | Pass      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 343,371    
2016 100,272    
2017 111,996    
2018 136,644    
2019 59,681    
2020 49,584    
Net loans 801,548   925,800
Owner occupied - commercial real estate | Watch      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 16,014    
2016 5,011    
2017 2,640    
2018 10,338    
2019 15,501    
Net loans 49,504   53,146
Owner occupied - commercial real estate | Special Mention      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 418    
2018 83,110    
2019 19,091    
Net loans 102,619    
Owner occupied - commercial real estate | Substandard      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 28,228    
2016 784    
2017 1,908    
2018 2,048    
2019 10,151    
2020 904    
Net loans 44,023   6,463
Real estate mortgage - residential      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 19,504    
2016 5,090    
2017 10,199    
2018 13,474    
2019 18,209    
2020 10,116    
Net loans 76,592 104,221 104,221
Real estate mortgage - residential | Pass      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 16,310    
2016 2,693    
2017 10,199    
2018 12,746    
2019 18,209    
2020 10,116    
Net loans 70,273   98,228
Real estate mortgage - residential | Watch      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 1,996    
2016 699    
2018 728    
Net loans 3,423   628
Real estate mortgage - residential | Substandard      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 1,198    
2016 1,698    
Net loans 2,896   5,365
Construction - commercial and residential      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 22,231    
2016 60,486    
2017 309,745    
2018 303,823    
2019 105,679    
2020 71,297    
Net loans 873,261 1,035,754 1,125,244
Construction - commercial and residential | Pass      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 21,290    
2016 60,486    
2017 266,788    
2018 297,480    
2019 105,679    
2020 71,297    
Net loans 823,020   1,113,734
Construction - commercial and residential | Watch      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 929    
2017 42,751    
2018 3,448    
Net loans 47,128    
Construction - commercial and residential | Special Mention      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 12    
2018 2,895    
Net loans 2,907    
Construction - commercial and residential | Substandard      
Loans and Leases Receivable Disclosure [Line Items]      
2016 0    
2017 206    
Net loans 206   11,510
C & I Owner Occupied      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 11,975    
2016 10,476    
2017 8,755    
2018 35,275    
2019 36,645    
2020 55,779    
Net loans 158,905    
C & I Owner Occupied | Pass      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 8,278    
2016 10,476    
2017 6,637    
2018 30,340    
2019 22,209    
2020 40,101    
Net loans 118,041    
C & I Owner Occupied | Watch      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 3,573    
2017 2,118    
2018 4,935    
2019 0    
Net loans 10,626    
C & I Owner Occupied | Special Mention      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 124    
2019 14,436    
2020 15,678    
Net loans 30,238    
Home equity      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 35,425    
2016 4,493    
2017 8,227    
2018 7,827    
2019 4,271    
2020 12,924    
Net loans 73,167 80,061 80,061
Home equity | Pass      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 33,226    
2016 4,493    
2017 8,227    
2018 7,827    
2019 4,224    
2020 12,924    
Net loans 70,921   78,626
Home equity | Watch      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 1,596    
Net loans 1,596   948
Home equity | Substandard      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 603    
2019 47    
Net loans 650   487
Other consumer      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 936    
2016 190    
2017 64    
2018 74    
2019 94    
2020 31    
Net loans 1,389 $ 2,160 2,160
Other consumer | Pass      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 929    
2016 190    
2017 64    
2018 74    
2019 94    
2020 31    
Net loans 1,382   $ 2,160
Other consumer | Substandard      
Loans and Leases Receivable Disclosure [Line Items]      
Prior 7    
Net loans $ 7