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Employee Benefit Plans - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) pension_plan shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($)
Defined Contribution Plan Disclosure [Line Items] |  |  |
Number of non-contributory defined-contribution retirement plans | pension_plan | 2 |  |
Common Stock, issued (in shares) | shares | 15,348,287 | 15,301,524 |
Common stock, value | $ 1,535 | $ 1,530 |
Expenses related to defined-contribution plans | 3,900 | 4,100 | $ 3,800
Employee stock ownership plan - expense recognized | $ 4,900 | 5,800 | 4,900
Incentive stock options (ISOPs), maximum contribution, percent | 4.00% |  |
Matching contributions to 401(k) plan cost | $ 2,600 | 2,500 | $ 2,400
Corporate owned life insurance | $ 81,928 | $ 80,106 |
DB Pension Plans |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Common Stock, issued (in shares) | shares | 42,192 | 42,192 |
Common stock, value | $ 3,200 | $ 3,400 |
Accumulated benefit obligation | 79,700 | 82,700 |
Unfunded status recognized in other liabilities | 7,215 | $ 2,594 |
Increase in service and interest costs | 1,300 |  |
Increase in benefit obligation amount | 39 |  |
Decrease in service and interest costs | 1,100 |  |
Decrease in benefit obligation, amount | $ 35 |  |
Expected long-term return on plan assets (percent) | 7.25% | 7.25% | 7.25%
DB Pension Plans | Maximum |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Rate of compensation increase (percent) | 5.90% |  |
DB Pension Plans | Minimum |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Rate of compensation increase (percent) | 4.50% |  |
DC Retirement Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Requisite service period | 1 year |  |
Maximum annual contribution, percent of account balances, percent | 4.00% |  |
Accumulated benefit obligation | $ 7,900 | $ 9,000 |
Unfunded status recognized in other liabilities | $ 7,857 | $ 8,995 |
Rate of compensation increase (percent) | 4.00% | 5.00% | 5.00%
SERP Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation | $ 23,500 | $ 26,100 |
Unfunded status recognized in other liabilities | $ 23,539 | $ 26,142 |
Rate of compensation increase (percent) | 5.00% | 5.00% | 5.00%
Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Benefit liability | $ 1,500 | $ 1,500 |
Compensation expense | $ 52 | $ 115 |

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- Definition Employee Stock Ownership Plan (ESOP), Incentive Stock Options (ISOPs), Maximum Employer Matching Contribution, Percent of Match + References No definition available. + Details
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- Definition The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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