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Accumulated Other Comprehensive Income (Loss) - Changes in the Components of Accumulated Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Changes in the Components of Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Balance $ 90,669 $ 64,459
Reevaluation of deferred tax asset valuation allowance [1] (206)  
Other comprehensive income before reclassifications (3,925) 1,577
Amounts reclassified from AOCI 25 3
Balance 88,311 66,438
Retirement Plans [Member]    
Changes in the Components of Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Balance (2,717) (3,152)
Reevaluation of deferred tax asset valuation allowance [1] (188)  
Other comprehensive income before reclassifications 0 0
Amounts reclassified from AOCI 46 65
Balance (2,859) (3,087)
Unrealized Gains and Losses on Available-for-Sale Securities [Member]    
Changes in the Components of Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Balance (216) (2,832)
Reevaluation of deferred tax asset valuation allowance [1] (15)  
Other comprehensive income before reclassifications (2,869) 1,572
Amounts reclassified from AOCI (21) (62)
Balance (3,121) (1,322)
Unrealized Losses on Derivatives and Hedging Activities [Member]    
Changes in the Components of Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Balance 0  
Reevaluation of deferred tax asset valuation allowance [1] 0  
Other comprehensive income before reclassifications (1,062)  
Amounts reclassified from AOCI 0  
Balance (1,062)  
Unrealized Loss on Securities Transferred to Held-to-Maturity [Member]    
Changes in the Components of Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Balance (38) (58)
Reevaluation of deferred tax asset valuation allowance [1] (3)  
Other comprehensive income before reclassifications 6 5
Amounts reclassified from AOCI 0 0
Balance (35) (53)
AOCI Attributable to Parent [Member]    
Changes in the Components of Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Balance (2,971) (6,042)
Reevaluation of deferred tax asset valuation allowance [1] 0  
Balance $ (7,077) $ (4,462)
[1] Management determined that the Company, under the current New York State (“NYS”) tax code, was highly unlikely to incur a material NYS tax liability in the foreseeable future. As a result, certain net current and deferred tax assets, related to GAAP vs. tax timing differences under previous NYS tax law were no longer going to provide any future tax benefit. The substantial majority of these net deferred tax assets were offset by a related valuation allowance established in prior periods. Therefore, the Company eliminated its remaining NYS net deferred tax asset balances and the related valuation allowance on January 1, 2020. The effect of these eliminations required an adjustment to other comprehensive income balances and had no effect on 2020 reported earnings.