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Employee Benefit Plans - Narrative (Details)
$ in Thousands
 12 Months Ended
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