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Deposits - Types of Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Banking And Thrift [Abstract]    
Noninterest-bearing deposits $ 54,107 $ 53,993
Interest-bearing deposits:    
Interest-bearing checking   2,099
Money market 86,754 89,329
Savings 1,101,065 886,718
Time deposits 2,987,196 2,117,444
Total Interest-bearing deposits 4,175,015 3,095,590
Total deposits $ 4,229,122 $ 3,149,583