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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
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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

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