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Deposits - Summary of Deposits (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Deposits [Abstract]    
GPR deposits $ 778,753 $ 803,549
Other demand deposits 90,981 61,264
Total non-interest bearing deposit accounts 869,734 864,813
Checking accounts 114,628 140,555
Savings 9,465 10,523
GPR deposits 7,198 0
Time deposits, denominations greater than or equal to $100 3,914 4,752
Time deposits, denominations less than $100 1,263 1,537
Total interest-bearing deposit accounts 136,468 157,367
Total deposits $ 1,006,202 $ 1,022,180