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Fair Value - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | $ 6,100,000 | $ 7,200,000 |  |
Alternative Investment, income recognized | $ 1,403,000 |  |  |
Discount percentage applied to real estate appraised values | 15.00% |  |  |
Discount percentage applied to lot development appraised values | 6.00% |  |  |
Partial charge-offs on impaired loans | $ 11,246,000 | 10,040,000 |  |
Allowance for loans individually evaluated for impairment | 2,273,000 | 684,000 |  |
Book Value Of Impaired Loans Carried At Fair Value | 6,503,000 | 3,577,000 |  |
Impaired loans carried at fair value | 6,399,000 | 3,574,000 |  |
Impaired Financing Receivable, Related Allowance | 2,273,000 | 684,000 |  |
Impaired Financing Receivable, carried at fair value, related expense | (400,000) | (1,600,000) | $ 900,000 |
MSR recorded at lower of cost or fair value | 10,178,000 | 9,688,000 | 9,266,000 | $ 9,008,000
Servicing Asset at Fair Value, Amount | 1,200,000 | 7,300,000 |  |
Valuation allowance of MSR | 232,000 | 630,000 | 735,000 | $ 542,000
MSRs recorded at cost | 9,000,000 | 2,400,000 |  |
Valuation allowance for impairment of recognized servicing assets, provisions (recoveries) | 398,000 | 105,000 | (193,000) |
Other Real Estate, Foreclosed Assets, and Repossessed Assets | $ 4,303,000 | $ 14,190,000 |  |
Percent of OREO held at fair value | 85.00% | 46.00% |  |
Estimated fair value of other real estate owned (OREO) | $ 3,700,000 | $ 6,500,000 |  |
OREO devaluations | 491,000 | 458,000 | $ 601,000 |
Other Repossessed Assets | 3,954,000 | 5,510,000 |  |
Other Assets, Fair Value Disclosure | 5,570,136,000 | 5,247,021,000 |  |
expense related to other repossessed assets | 269,000 | 0 |  |
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Impaired Financing Receivable, Related Allowance | 104,000 | 3,000 |  |
Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Alternative Investment | 11,000,000 | 8,800,000 |  |
Accounting Standards Update 2016-01 [Member] | Assets [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | 1,200,000 |  |
Accounting Standards Update 2016-01 [Member] | Retained Earnings |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | $ 922,000 |  |
Commercial Portfolio Segment [Member] | Purchased credit impaired [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Impaired loans carried at fair value | $ 0 |  |  |

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