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General (Details) - USD ($) $ in Thousands	Jan. 01, 2020	Jun. 30, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans		$ 9,298,541	$ 8,459,310
Estimated | One-time cumulative-effect adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Life of loan portfolio	4 years
Reserve for potential losses from unfunded commitments	$ 18,000
Estimated | One-time cumulative-effect adjustment | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in allowance	55.00%
Estimated | One-time cumulative-effect adjustment | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in allowance	65.00%
Payment deferrals, fee waivers, extensions of repayment terms, or other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans		$ 1,100,000
Percent of loan portfolio modified		12.10%

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Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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