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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 |  |  |

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