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Fair Value of Assets and Liabilities - Summary Of Differences Between The Fair Value Carrying Amount Of Mortgages Held-For-Sale And Aggregate Unpaid Principal Amount (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Loans held-for-sale $ 14,033 $ 16,273  
Fair value carrying amount less aggregate unpaid principal - Total loans (5,245) (7,294)  
Nonaccrual loans 3,532 4,536  
Fair value carrying amount less aggregate unpaid principal - Nonaccrual loans (3,114) (3,592)  
Loans 90 days or more past due and still accruing 163 171  
Fair value carrying amount less aggregate unpaid principal - Loans 90 days or more past due and still accruing (105) (110)  
Aggregate unpaid principal      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Loans held-for-sale 19,278 23,567  
Nonaccrual loans 6,646 8,128  
Loans 90 days or more past due and still accruing 268 281  
Loans Held For Sale | Mortgage Banking Noninterest Income      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Changes in fair value, gain (loss) $ 1,828 $ 1,239 $ 1,547