XML 115 R102.htm IDEA: XBRL DOCUMENT v3.7.0.1
Employee Benefit Plans (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation $ 58,000 $ 53,500  
Number of consecutive years used for compensation calculation 5 years    
Investment strategy, percentage in long-term growth 97.00%    
Investment strategy, percentage in near-term benefit payments 3.00%    
Maximum percentage of securities purchasing allowed of the portfolio at any time 5.00%    
Maximum market value purchase percentage allowed of any one issuer 8.00%    
Expense included in salaries and employee benefits   1,300 $ 1,100
Postretirement Benefit Plan, Accrued liabilities $ 149 $ 107  
Estimated future net loss for the plan that will be amortized from accumulated other comprehensive income 1,200    
Estimated future prior service credit for the plan that will be amortized from accumulated other comprehensive income $ 51    
Maximum percent of participant's contribution match 4.50%    
Securities Less Than Aquality [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Maximum percentage of securities purchasing allowed of the portfolio at any time 13.00%    
Commercial Mortgage Back Securities And Assets Backed Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Maximum percentage of securities purchasing allowed of the portfolio at any time 10.00%    
Portfolio Concentration Commingled Trust Fund1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of Plan Assets 14.00% 11.00%  
Portfolio Concentration Commingled Trust Fund2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of Plan Assets 6.00% 7.00%  
Portfolio Concentration Exchange Traded Fund [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of Plan Assets   7.00%  
Portfolio Concentration Short Term Investment Fund [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of Plan Assets 6.00% 5.00%  
Investment Firm One [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Portfolio management, controlled percentage 58.00% 58.00%  
Investment Firm Two [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Portfolio management, controlled percentage 38.00% 38.00%  
Defined Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Portfolio management, controlled percentage 4.00% 4.00%  
First 3% Of Participant's Contribution [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Percentage employer matches of the employee's percentage contribution matched 100.00%    
Percentage for which the employer contributes a matching contribution 3.00%    
Next 3% Of Participant's Contribution [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Percentage employer matches of the employee's percentage contribution matched 50.00%    
Percentage for which the employer contributes a matching contribution 3.00%    
SERP [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Unfunded pension liability $ 2,100 $ 2,300  
Pension expense $ 88 $ 408 $ 295