Borrowings - Summary of Balances for Securities Sold Under Agreements to Repurchase (Details) - Mortgage Backed Securities - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Assets Sold under Agreements to Repurchase [Line Items]
Balance at year end	$ 23,745	$ 15,081
Average daily balance during the year	$ 22,798	$ 16,128
Average interest rate during the year	0.84%	0.28%
Maximum month-end balance during the year	$ 30,273	$ 19,651
Weighted average interest rate at year-end	0.89%	0.74%