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Allowance Allocations (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Provision for credit losses $ 0 $ 7,500 $ 20,000 $ 25,000 $ 4,000 $ 0 $ 1,000 $ 1,000 $ 4,775 $ 52,500 $ 6,000 $ 4,775  
Loans and Leases Receivable, Allowance 113,392       67,740         113,392 67,740 64,293 $ 60,643
Allowance for Loan and Lease Losses, Write-offs                 (2,597)   (5,205)    
Allowance for Loan and Lease Loss, Recovery of Bad Debts                 1,472   2,652    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment         66,760           66,760 63,214  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment         980           980 1,079  
Financing Receivable, Collectively Evaluated for Impairment         8,809,155           8,809,155 6,838,339  
Financing Receivable, Individually Evaluated for Impairment         49,628           49,628 59,060  
Financing Receivable, after Allowance for Credit Loss         6,119,185           6,119,185    
Total loans 9,392,866       8,873,639         9,392,866 8,873,639 6,906,194  
Commercial and Industrial [Member]                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Provision for credit losses                 2,677   947    
Loans and Leases Receivable, Allowance         17,594           17,594 15,760 13,256
Allowance for Loan and Lease Losses, Write-offs                 (355)   (244)    
Allowance for Loan and Lease Loss, Recovery of Bad Debts                 182   1,131    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment         17,468           17,468 15,753  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment         126           126 7  
Financing Receivable, Collectively Evaluated for Impairment         1,370,580           1,370,580 1,064,800  
Financing Receivable, Individually Evaluated for Impairment         24,456           24,456 28,829  
Financing Receivable, after Allowance for Credit Loss         1,395,036           1,395,036    
Financing Receivable, before Allowance for Credit Loss 2,103,152       1,395,036         2,103,152 1,395,036    
Total loans 2,103,152       1,395,036         2,103,152 1,395,036 1,093,629  
Commercial Real Estate [Member]                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Provision for credit losses                 811   3,027    
Loans and Leases Receivable, Allowance         32,935           32,935 32,370 31,453
Allowance for Loan and Lease Losses, Write-offs                 (82)   (2,614)    
Allowance for Loan and Lease Loss, Recovery of Bad Debts                 188   152    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment         32,887           32,887 32,333  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment         48           48 37  
Financing Receivable, Collectively Evaluated for Impairment         3,987,848           3,987,848 3,235,418  
Financing Receivable, Individually Evaluated for Impairment         8,337           8,337 10,839  
Financing Receivable, after Allowance for Credit Loss         4,002,359           4,002,359    
Financing Receivable, before Allowance for Credit Loss 4,173,927       4,002,359         4,173,927 4,002,359    
Total loans 4,173,927       4,002,359         4,173,927 4,002,359 3,251,248  
Construction Loans [Member]                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Provision for credit losses                 (540)   895    
Loans and Leases Receivable, Allowance         6,053           6,053 5,158 5,698
Allowance for Loan and Lease Losses, Write-offs                 0   0    
Allowance for Loan and Lease Loss, Recovery of Bad Debts                 0   0    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment         6,053           6,053 5,158  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment         0           0    
Financing Receivable, Collectively Evaluated for Impairment         547,293           547,293 365,165  
Financing Receivable, Individually Evaluated for Impairment         0           0 0  
Financing Receivable, after Allowance for Credit Loss         547,293           547,293    
Financing Receivable, before Allowance for Credit Loss 553,929       547,293         553,929 547,293    
Total loans 553,929       547,293         553,929 547,293 365,165  
Small Business [Member]                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Provision for credit losses                 505   377    
Loans and Leases Receivable, Allowance         1,746           1,746 1,756 1,577
Allowance for Loan and Lease Losses, Write-offs                 (372)   (509)    
Allowance for Loan and Lease Loss, Recovery of Bad Debts                 46   122    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment         1,738           1,738 1,755  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment         8           8 1  
Financing Receivable, Collectively Evaluated for Impairment         173,960           173,960 164,135  
Financing Receivable, Individually Evaluated for Impairment         537           537 541  
Financing Receivable, after Allowance for Credit Loss         174,497           174,497    
Financing Receivable, before Allowance for Credit Loss 175,023       174,497         175,023 174,497    
Total loans 175,023       174,497         175,023 174,497 164,676  
Residential Real Estate [Member]                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Provision for credit losses                 533   79    
Loans and Leases Receivable, Allowance         3,440           3,440 3,219 2,822
Allowance for Loan and Lease Losses, Write-offs                 (148)   0    
Allowance for Loan and Lease Loss, Recovery of Bad Debts                 12   142    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment         2,803           2,803 2,357  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment         637           637 862  
Financing Receivable, Collectively Evaluated for Impairment         1,571,848           1,571,848 906,959  
Financing Receivable, Individually Evaluated for Impairment         11,228           11,228 12,706  
Financing Receivable, before Allowance for Credit Loss 1,296,183       1,590,569         1,296,183 1,590,569    
Total loans 1,296,183       1,590,569         1,296,183 1,590,569 923,294  
Home Equity [Member]                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Provision for credit losses                 355   (110)    
Loans and Leases Receivable, Allowance         5,576           5,576 5,608 5,390
Allowance for Loan and Lease Losses, Write-offs                 (293)   (240)    
Allowance for Loan and Lease Loss, Recovery of Bad Debts                 156   318    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment         5,420           5,420 5,444  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment         156           156 164  
Financing Receivable, Collectively Evaluated for Impairment         1,127,963           1,127,963 1,085,961  
Financing Receivable, Individually Evaluated for Impairment         4,948           4,948 5,948  
Total loans 1,068,790       1,133,798         1,068,790 1,133,798 1,092,084  
Consumer Portfolio Segment [Member]                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Provision for credit losses                 434   785    
Loans and Leases Receivable, Allowance         396           396 422 $ 447
Allowance for Loan and Lease Losses, Write-offs                 (1,347)   (1,598)    
Allowance for Loan and Lease Loss, Recovery of Bad Debts                 $ 888   787    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment         391           391 414  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment         5           5 8  
Financing Receivable, Collectively Evaluated for Impairment         29,663           29,663 15,901  
Financing Receivable, Individually Evaluated for Impairment         122           122 197  
Financing Receivable, before Allowance for Credit Loss 21,862       30,087         21,862 30,087    
Total loans $ 21,862       30,087 [1]         $ 21,862 30,087 [1] 16,098  
Financial Asset Acquired with Credit Deterioration [Member]                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Financing Receivable, after Allowance for Credit Loss         14,856           14,856 8,795  
Financial Asset Acquired with Credit Deterioration [Member] | Commercial and Industrial [Member]                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Financing Receivable, after Allowance for Credit Loss         0           0 0  
Financial Asset Acquired with Credit Deterioration [Member] | Commercial Real Estate [Member]                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Financing Receivable, after Allowance for Credit Loss         6,174           6,174 4,991  
Financial Asset Acquired with Credit Deterioration [Member] | Construction Loans [Member]                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Financing Receivable, after Allowance for Credit Loss         0           0 0  
Financial Asset Acquired with Credit Deterioration [Member] | Small Business [Member]                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Financing Receivable, after Allowance for Credit Loss         0           0 0  
Financial Asset Acquired with Credit Deterioration [Member] | Residential Real Estate [Member]                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Financing Receivable, after Allowance for Credit Loss         7,493           7,493 3,629  
Financial Asset Acquired with Credit Deterioration [Member] | Home Equity [Member]                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Financing Receivable, after Allowance for Credit Loss         887           887 175  
Financial Asset Acquired with Credit Deterioration [Member] | Consumer Portfolio Segment [Member]                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Financing Receivable, after Allowance for Credit Loss         $ 302           $ 302 $ 0  
[1] Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.