Recent Accounting Pronouncements (Additional Information) (Details) $ in Thousands	Mar. 31, 2020 USD ($) segment	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($) segment	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net reduction of retained earnings upon adoption of ASC 326	$ (583,540)		$ (573,820)	$ (479,187)	$ (458,640)
Allowance for Credit Losses	$ 36,641	$ 31,931	$ 16,278	16,243	15,823
Number of loan segments | segment	8		6
Accrued interest receivable	$ 12,350		$ 13,929
Impact of adopting ASC 326 - PCD Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Credit Losses			405
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net reduction of retained earnings upon adoption of ASC 326	$ (253,780)		(253,090)	$ (222,246)	$ (211,424)
Impact of ASC 326 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net reduction of retained earnings upon adoption of ASC 326			6,717
Allowance for Credit Losses		15,653
Impact of ASC 326 Adoption | Impact of adopting ASC 326 - PCD Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Credit Losses			6,886
Impact of ASC 326 Adoption | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net reduction of retained earnings upon adoption of ASC 326		$ 6,717	$ 6,717