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Recent Accounting Pronouncements (Narrative) (Details) $ in Thousands	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jan. 01, 2020 USD ($) segment	Dec. 31, 2019 USD ($) segment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net reduction of retained earnings upon adoption of ASC 326	$ (648,997)	$ (617,213)	$ (624,709)	$ (594,674)	$ (583,540)		$ (573,820)
Allowance for credit losses	39,995	45,099	46,859	42,431	36,641	$ 31,931	$ 16,278
Number of loan segments | segment						8	6
Accrued interest receivable on loans	10,775		14,133
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net reduction of retained earnings upon adoption of ASC 326	$ (320,717)	$ (302,450)	$ (288,447)	$ (263,011)	$ (253,780)		$ (253,090)
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 | PCD Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses						6,886	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

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