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Recent Accounting Pronouncements (Narrative) (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
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 $ (617,213) $ (624,709) $ (583,540)   $ (573,820)
Allowance for credit losses 45,099 46,859 36,641 $ 31,931 $ 16,278
Number of loan segments | segment       8 6
Accrued interest receivable 13,141        
Retained Earnings          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Net reduction of retained earnings upon adoption of ASC 326 $ (302,450) $ (288,447) $ (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