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Loans and Loans Held for Sale - Additional Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
Jun. 30, 2020
USD ($)
loan
Mar. 31, 2020
USD ($)
Jun. 30, 2019
USD ($)
loan
Jun. 30, 2020
USD ($)
note
loan
Jun. 30, 2019
USD ($)
loan
Dec. 31, 2019
USD ($)
Jan. 01, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Loans, net of unearned income $ 16,700 $ 4,600 $ 16,700     $ 16,700   $ 4,600      
Purchase accounting fair value adjustments 10,500 12,300                  
Total loans                 $ 7,074,928    
Threshold period of satisfactory performance for troubled debt restructuring to be restored to accruing status           6 months          
Restructured loans [1],[2]     1,304   $ 6,427 $ 7,853 $ 11,248        
Allowance for credit loss $ 114,609 $ 62,224 $ 114,609 $ 96,850 $ 61,479 $ 114,609 $ 61,479 $ 62,224 $ 62,224 $ 61,409 $ 60,996
Number of troubled debt restructuring loans returned to accruing status | loan     4   3 4 4        
Amount of trouble debt restructuring loans returned to accruing status     $ 100   $ 100 $ 100 $ 1,800        
Number of loans | loan [2]     11   14 20 25        
Number of commitments to lend additional funds on TDRs | loan 22   22     22          
Commitments to lend additional funds on TDRs $ 3,100   $ 3,100     $ 3,100          
Minimum period of loan payment defaults following restructure for TDRs to be in default           90 days          
Number of defaulted TDRs that were restructured within the last twelve months prior to defaulting | loan     1   0 11 0        
Amount of defaulted TDRs that were restructured within the last twelve months prior to defaulting     $ 100     $ 21,100          
Number of notes related to individual customer resulting in an increase in defaulted troubled debt restructuring loans due to Covid-19 | note           5          
Commercial                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Percentage of commercial loans in total portfolio loans 78.80% 77.20% 78.80%     78.80%   77.20%      
Commercial loans   $ 5,512,796           $ 5,512,796      
Commercial real estate                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Restructured loans [1]     $ 0   $ 6,090 $ 2,210 $ 6,090        
Allowance for credit loss         $ 32,836   $ 32,836     34,903 33,707
Number of loans | loan     0   3 1 3        
Commercial real estate | Commercial                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Commercial loans   3,416,518           3,416,518      
Allowance for credit loss $ 57,730 30,577 $ 57,730 42,611   $ 57,730   30,577      
Commercial and industrial                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Restructured loans [1]     $ 102   $ 0 $ 2,170 $ 4,529        
Allowance for credit loss         $ 13,227   $ 13,227     $ 11,996 $ 11,596
Number of loans | loan     2   0 3 1        
Commercial and industrial | Commercial                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Commercial loans   1,720,833           1,720,833      
Allowance for credit loss 19,164 15,681 $ 19,164 19,870   $ 19,164   15,681      
Customer fraud                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total loans 15,100   15,100     15,100          
CRE and commercial construction | Commercial                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Commercial loans $ 3,800,000 $ 3,800,000 $ 3,800,000     $ 3,800,000   $ 3,800,000      
Combined percentage of commercial real estate and commercial construction in total commercial loans 64.00% 68.80% 64.00%     64.00%   68.80%      
Combined percentage of commercial real estate and commercial construction in total portfolio loans 50.40% 53.10% 50.40%     50.40%   53.10%      
Concentration risk percentage of commercial real estate and commercial construction           0.00%   0.00%      
Maximum concentration of commercial real estate and commercial construction portfolio in loans (in excess of) 14.00% 11.00% 14.00%     14.00%   11.00%      
Out of market exposure of combined portfolio (percent) 5.70% 5.40% 5.70%     5.70%   5.40%      
Percentage of total loans out-of-state excluding contiguous states 3.00% 2.90% 3.00%     3.00%   2.90%      
CARES Act, Paycheck Protection Program Loans                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total loans $ 547,600   $ 547,600     $ 547,600          
Restructured loans           $ 1,400,000          
Number of loans | loan           2,360          
Nonperforming TDRs | Commercial real estate                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Restructured loans       $ 20,500   $ 20,500          
Allowance for credit loss $ 600   600     600          
Nonperforming TDRs | Commercial and industrial                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Restructured loans           4,300          
Nonperforming TDRs | Customer fraud                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Restructured loans     $ 10,900     $ 10,900          
[1] Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end.
[2] Refer to Note 1, Basis of Presentation for details of reclassification of our portfolio segments related to the adoption of ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instrument.