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Loans and Allowance for Credit Losses - Risk category of loans by class of loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
2016 $ 794,802    
2017 1,556,354    
2018 1,684,526    
2019 1,428,027    
2020 297,928    
Prior 2,079,236    
Loans 7,840,873   $ 7,545,748
Pass      
Loans     7,356,769
Special Mention      
Loans     11,460
Substandard      
Loans     68,206
Watch      
Loans     109,313
Commercial      
2016 150,948    
2017 369,606    
2018 338,596    
2019 269,631    
2020 113,862    
Prior 530,835    
Loans 1,773,478 $ 1,545,906 1,545,906
Commercial | Pass      
2016 146,077    
2017 339,954    
2018 324,160    
2019 267,490    
2020 113,862    
Prior 495,376    
Loans 1,686,919   1,470,636
Commercial | Special Mention      
2017 11,108    
2018 11,365    
Prior 1,111    
Loans 23,584   11,460
Commercial | Substandard      
2016 4,871    
2017 1,652    
2018 2,577    
2019 1,131    
Prior 18,520    
Loans 28,751   25,288
Commercial | Watch      
2017 16,892    
2018 494    
2019 1,010    
Prior 15,828    
Loans 34,224   38,522
Income Producing - Commercial Real Estate      
2016 418,098    
2017 595,868    
2018 739,669    
2019 907,809    
2020 147,214    
Prior 1,018,366    
Loans 3,827,024 3,702,747 3,702,747
Income Producing - Commercial Real Estate | Pass      
2016 417,298    
2017 586,243    
2018 736,476    
2019 897,933    
2020 147,214    
Prior 1,005,065    
Loans 3,790,229   3,667,585
Income Producing - Commercial Real Estate | Special Mention      
2016 800    
2019 5,542    
Prior 4,854    
Loans 11,196    
Income Producing - Commercial Real Estate | Substandard      
2017 4,984    
2018 3,193    
Prior 7,082    
Loans 15,259   19,093
Income Producing - Commercial Real Estate | Watch      
2017 4,641    
2019 4,334    
Prior 1,365    
Loans 10,340   16,069
Owner Occupied - Commercial Real Estate      
2016 115,681    
2017 120,780    
2018 229,309    
2019 92,231    
2020 689    
Prior 412,944    
Loans 971,634 985,409 985,409
Owner Occupied - Commercial Real Estate | Pass      
2016 112,140    
2017 120,780    
2018 226,702    
2019 92,231    
2020 689    
Prior 369,509    
Loans 922,051   925,800
Owner Occupied - Commercial Real Estate | Substandard      
2016 850    
Prior 8,935    
Loans 9,785   6,463
Owner Occupied - Commercial Real Estate | Watch      
2016 2,691    
2018 2,607    
Prior 34,500    
Loans 39,798   53,146
Real Estate Mortgage Residential      
2016 7,590    
2017 14,638    
2018 24,773    
2019 29,207    
2020 4,203    
Prior 24,147    
Loans 104,558 104,221 104,221
Real Estate Mortgage Residential | Pass      
2016 3,436    
2017 11,950    
2018 24,773    
2019 29,207    
2020 4,203    
Prior 22,316    
Loans 95,885   98,228
Real Estate Mortgage Residential | Substandard      
2016 4,154    
2017 2,688    
Prior 1,211    
Loans 8,053   5,365
Real Estate Mortgage Residential | Watch      
Prior 620    
Loans 620   628
Construction - Commercial and Residential      
2016 84,945    
2017 439,708    
2018 292,994    
2019 102,645    
2020 17,223    
Prior 31,651    
Loans 969,166 1,035,754 1,125,244
Construction - Commercial and Residential | Pass      
2016 82,642    
2017 437,815    
2018 292,994    
2019 102,645    
2020 17,223    
Prior 28,972    
Loans 962,291   1,113,734
Construction - Commercial and Residential | Substandard      
2016 2,303    
2017 1,893    
Prior 2,679    
Loans 6,875   11,510
Home Equity      
2016 5,598    
2017 9,349    
2018 8,729    
2019 4,935    
2020 931    
Prior 48,686    
Loans 78,228 80,061 80,061
Home Equity | Pass      
2016 5,598    
2017 9,349    
2018 8,729    
2019 4,935    
2020 931    
Prior 47,201    
Loans 76,743   78,626
Home Equity | Substandard      
Prior 541    
Loans 541   487
Home Equity | Watch      
Prior 944    
Loans 944   948
Other Consumer      
2016 200    
2017 203    
2018 136    
2019 109    
2020 1,173    
Prior 826    
Loans 2,647 2,160 2,160
Other Consumer | Pass      
2016 200    
2017 203    
2018 136    
2019 109    
2020 1,173    
Prior 810    
Loans 2,631   2,160
Other Consumer | Substandard      
Prior 16    
Loans 16    
C & I Owner Occupied      
2016 11,742    
2017 6,202    
2018 50,320    
2019 21,460    
2020 12,633    
Prior 11,781    
Loans 114,138 $ 89,490  
C & I Owner Occupied | Pass      
2016 11,742    
2017 4,073    
2018 39,220    
2019 21,460    
2020 12,633    
Prior 11,062    
Loans 100,190    
C & I Owner Occupied | Watch      
2017 2,129    
2018 11,100    
Prior 719    
Loans 13,948    
C & I Owner Occupied | Construction - Commercial and Residential      
Loans $ 114,138   $ 89,490