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Deposits and Related Interest (Deposits by Components) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Deposits and Related Interest [Abstract]    
Non-interest bearing demand deposits $ 2,695,993 $ 2,259,048
Interest-bearing savings and demand deposits 5,213,342 4,274,586
Retail certificates of deposist 1,087,160 1,540,406
Institutional certificates of deposit 236,528 292,485
Total core deposits 9,233,023 8,366,525
Brokered deposists 11,366 49,115
Total deposits $ 9,244,389 $ 8,415,640