Fair Value of Assets & Liabilities - Summary Of Differences Between The Fair Value Carrying Amount Of Mortgages Held-For-Sale And Aggregate Unpaid Principal Amount (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans held-for-sale	$ 13,584	$ 14,033
Fair value carrying amount less aggregate unpaid principal - Total loans	(4,962)	(5,245)
Nonaccrual loans	3,181	3,532
Fair value carrying amount less aggregate unpaid principal - Nonaccrual loans	(2,888)	(3,114)
Loans 90 days or more past due and still accruing	190	163
Fair value carrying amount less aggregate unpaid principal - Loans 90 days or more past due and still accruing	(78)	(105)
Aggregate unpaid principal
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans held-for-sale	18,546	19,278
Nonaccrual loans	6,069	6,646
Loans 90 days or more past due and still accruing	$ 268	$ 268