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Other Benefit Plans (Narrative) (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Deferred Compensation Arrangement with Individual, Recorded Liability $ 143,000 $ 160,000  
Deferred compensation arrangement with individual, compensation expense 6,000 9,000 $ 6,000
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan, associated expense 0 0 0
Director's Retirement Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Deferred Compensation Arrangement with Individual, Recorded Liability 606,000 523,000  
Deferred compensation arrangement with individual, compensation expense 21,000 17,000 16,000
Cash surrender value of bank owned life insurance 3,834,000 3,764,000  
Salary Continuation Agreement [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Deferred Compensation Arrangement with Individual, Recorded Liability 254,000 237,000  
Deferred compensation arrangement with individual, compensation expense $ 17,000 16,000 15,000
Defined benefit plan, maximum coverage period 15 years    
Cash surrender value of bank owned life insurance $ 1,284,000 1,253,000  
Split Dollar Life Insurance Arrangements [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Cash surrender value of bank owned life insurance 1,801,000 1,806,000  
Split Dollar Life Insurance Arrangements [Member] | Phoenix Bancorp Inc. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Cash surrender value of bank owned life insurance 3,838,000 3,749,000  
401(k) Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan, associated expense $ 362,000 $ 321,000 $ 216,000