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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Loans held-for-sale $ 16,273 $ 20,881  
Fair value carrying amount less aggregate unpaid principal - Total loans (7,294) (8,874)  
Nonaccrual loans 4,536 5,783  
Fair value carrying amount less aggregate unpaid principal - Nonaccrual loans (3,592) (5,098)  
Loans 90 days or more past due and still accruing 171 0  
Fair value carrying amount less aggregate unpaid principal - Loans 90 days or more past due and still accruing (110) 0  
Aggregate unpaid principal      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Loans held-for-sale 23,567 29,755  
Nonaccrual loans 8,128 10,881  
Loans 90 days or more past due and still accruing 281 0  
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) $ 1,239 $ 1,547 $ 3,380