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Deposits - Composition of Deposits (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Deposits [Abstract]    
Non-interest-bearing demand deposits $ 2,117,749 $ 1,762,676
Interest-bearing checking accounts 652,824 494,424
Money market demand accounts 1,057,419 1,142,709
Other savings 627,294 564,700
Time deposits (below $250,000) 553,364 600,810
Time deposits ($250,000 and above) 149,628 186,712
Total deposits $ 5,158,278 $ 4,752,031