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Significant Accounting Policies - Impact of new financial accounting standards (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Recently Issued Accounting Standards
Stockholders' Equity Attributable to Parent	$ 1,270,069		$ 1,220,434	$ 994,964	$ 935,003
Right of use asset	7,714		9,490
Lease liabilities	7,757		9,552
Retained Earnings (Accumulated Deficit)	$ 20,830		(14,813)
Cumulative Effect, Period of Adoption, Adjustment
Recently Issued Accounting Standards
Stockholders' Equity Attributable to Parent			$ (15,922)
Retained Earnings (Accumulated Deficit)		$ (15,900)
Cumulative Effect, Period of Adoption, Adjustment | Allowance for credit losses on loans
Recently Issued Accounting Standards
Retained Earnings (Accumulated Deficit)		12,000
Cumulative Effect, Period of Adoption, Adjustment | Reserve for off-balance-sheet credit exposures
Recently Issued Accounting Standards
Retained Earnings (Accumulated Deficit)		$ 3,900

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