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Deposits and Related Interest (Narratives) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Deposits and Related Interest [Abstract]    
Weighted Average Rate Domestic Deposit 0.54% 0.80%
Time Deposits, $250,000 or More $ 413,700 $ 628,400
Public Fund Collateral Investments 290,700 242,800
Accrued Interest, Time Deposits 731 1,500
Bank Overdrafts 475 1,100
Brokered Certificates of Deposits 11,400 25,000
Brokered Money Market Deposit   24,100
Reclassified from brokered deposits to interest-bearing savings accounts 23,300  
Time Deposits [Line Items]    
Deposits 9,244,389 8,415,640
Aggregate amount of uninsured deposits 3,896,000 3,179,000
Government Sector [Member]    
Time Deposits [Line Items]    
Deposits $ 281,700 $ 218,900