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Loans - Narrative (Details)
 3 Months Ended 6 Months Ended
Jan. 01, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
loan
Jun. 30, 2019
USD ($)
loan
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Purchased with Credit Deterioration, Discount (Premium)       $ 22,200,000      
Number of loans over 90 days past due and still accruing interest | loan             0
Unadvanced commitments on impaired loans             $ 225,000
Financing Receivable, Amount Eligible for Deferred Payment   $ 685,700,000   685,700,000      
Financing Receivable, Amount Eligible for Deferral of Both Principal and Interest   361,400,000   361,400,000      
Financing Receivable, Amount Eligible for Deferral of Principal Only   324,300,000   324,300,000      
Loans and Leases Receivable, Deferred Income   4,000,000.0   4,000,000.0      
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available   2,400,000,000   2,400,000,000      
Financing receivable, allowance for credit loss $ 43,288,000            
Financing Receivable, Paycheck Protection Program   830,200,000   830,200,000      
Financing Receivable, Paycheck Protection Program, Net of Deferred Fees   807,800,000   807,800,000      
Financing Receivable, Paycheck Protection Program, Unearned Fees   22,400,000   22,400,000      
Unadvanced Commitment on Impaired Loan              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Estimated losses attributable to unadvanced commitments on impaired loans   4,900,000   4,900,000     400,000
Non-Covered Loans              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) 28,387,000            
Provision for credit losses (1,680,000) 18,400,000 $ 1,700,000 40,100,000 $ 3,200,000    
Financing Receivable, Allowance for Credit Loss, Threshold of Loans Written Off 100,000            
Post-Modification Outstanding Recorded Balance       $ 3,886,000 $ 520,000    
Financing Receivable, Modifications, Number of Contracts | loan       3 3    
Restructuring Reserve   3,720,000   $ 3,720,000     79,000
Financing Receivable, before Allowance for Credit Loss   6,164,492,000   6,164,492,000     5,316,953,000
Financing receivable, allowance for credit loss 69,995,000 110,270,000   110,270,000   $ 92,187,000 43,288,000
Non-Covered Loans | Enterprise Value Lending Portfolio Niche Segment [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing receivable, allowance for credit loss   15,800,000   15,800,000      
Non-Covered Loans | Other              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) (84,000)            
Provision for credit losses 0            
Restructuring Reserve   0   0     0
Financing Receivable, before Allowance for Credit Loss   142,224,000   142,224,000     134,941,000
Financing receivable, allowance for credit loss 1,050,000 1,729,000   1,729,000   $ 1,547,000 1,134,000
Non-Covered Loans | Agriculture Portfolio Niche Segment [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing receivable, allowance for credit loss   2,400,000   2,400,000      
Financial Asset Acquired with Credit Deterioration [Member] | Non-Covered Loans              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, before Allowance for Credit Loss             $ 90,300,000
Cumulative Effect, Period Of Adoption, Adjustment              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing receivable, allowance for credit loss $ 28,387,000            
Cumulative Effect, Period Of Adoption, Adjustment | Non-Covered Loans              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing receivable, allowance for credit loss   $ 1,000,000.0   $ 1,000,000.0