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, 2019	Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans held-for-sale	$ 15,751	$ 16,273
Fair value carrying amount less aggregate unpaid principal - Total loans	(6,817)	(7,294)
Nonaccrual loans	4,382	4,536
Fair value carrying amount less aggregate unpaid principal - Nonaccrual loans	(3,379)	(3,592)
Loans 90 days or more past due and still accruing	0	171
Fair value carrying amount less aggregate unpaid principal - Loans 90 days or more past due and still accruing	0	(110)
Aggregate unpaid principal
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans held-for-sale	22,568	23,567
Nonaccrual loans	7,761	8,128
Loans 90 days or more past due and still accruing	$ 0	$ 281