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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
Sep. 30, 2018
Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loans held-for-sale (elected fair value) $ 16,418 $ 20,881
Fair value carrying amount less aggregate unpaid principal - Total loans (7,479) (8,874)
Nonaccrual loans 4,483 5,783
Fair value carrying amount less aggregate unpaid principal - Nonaccrual loans (3,877) (5,098)
Loans 90 days or more past due and still accruing 0 0
Fair value carrying amount less aggregate unpaid principal - Loans 90 days or more past due and still accruing 0 0
Aggregate unpaid principal    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loans held-for-sale (elected fair value) 23,897 29,755
Nonaccrual loans 8,360 10,881
Loans 90 days or more past due and still accruing $ 0 $ 0