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Borrowings - Summary of FHLB and Repurchase Agreements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
FHLB Advances    
Debt Instrument [Line Items]    
Average balance during year $ 518,372 $ 448,012
Maximum outstanding at any month end $ 776,000 $ 475,582
Weighted average interest rate at end of year 2.04% 1.95%
Weighted average interest rate during year 2.08% 1.82%
Repurchase Agreements    
Debt Instrument [Line Items]    
Average balance during year $ 45,342 $ 0
Maximum outstanding at any month end $ 75,000 $ 0
Weighted average interest rate at end of year 2.30% 0.00%
Weighted average interest rate during year 2.35% 0.00%