Recent Accounting Pronouncements (Additional Information) (Details) $ in Thousands	Jan. 01, 2020 USD ($)	Jun. 30, 2020 USD ($) segment	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) segment	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Accounting Policies [Abstract]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net reduction of retained earnings upon adoption of ASC 326		$ (594,674)	$ (583,540)	$ (573,820)	$ (499,411)	$ (479,187)	$ (458,640)
Allowance for Credit Losses	$ 31,931	$ 42,431	36,641	$ 16,278	16,239	16,243	15,823
Number of loan segments | segment		8		6
Accrued interest receivable		$ 14,726		$ 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		$ (263,011)	$ (253,780)	(253,090)	$ (233,269)	$ (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