Short-term Borrowings and Long-term FHLB Advances - Summary of Short-term Borrowings (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Short-term Debt [Line Items]
Short-term borrowings	$ 72,161	$ 493,219
Repurchase agreements – commercial customers
Short-term Debt [Line Items]
Short-term borrowings	38,836	10,819
Short-term FHLB advances
Short-term Debt [Line Items]
Short-term borrowings	$ 33,325	$ 482,400