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Regulations and Supervision (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
banking_office
Dec. 31, 2018
USD ($)
subsidiary_bank
Dec. 31, 2018
USD ($)
subsidiary_trust
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]            
Reclassification from accumulated other comprehensive income (loss) to retained earnings $ 0       $ 9,958 $ 0
Number of subsidiary banks   4 3 4    
Castile            
Total Capital (to risk-weighted assets)            
Total Capital (to risk-weighted assets), Actual Amount $ 138,816 $ 138,816 $ 138,816 $ 138,816 $ 125,510  
Total Capital (to risk-weighted assets), Actual Ratio 11.70% 11.70% 11.70% 11.70% 11.30%  
Total Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount $ 124,738 $ 124,738 $ 124,738 $ 124,738 $ 117,042  
Total Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio 10.50% 10.50% 10.50% 10.50% 10.50%  
Total Capital (to risk-weighted assets), Required to be Well Capitalized, Amount $ 118,798 $ 118,798 $ 118,798 $ 118,798 $ 111,469  
Total Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio 10.00% 10.00% 10.00% 10.00% 10.00%  
Common EquityTier 1 Capital (to risk-weighted assets)            
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Amount $ 129,482 $ 129,482 $ 129,482 $ 129,482 $ 116,783  
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Ratio 10.90% 10.90% 10.90% 10.90% 10.50%  
Common Equity Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount $ 83,159 $ 83,159 $ 83,159 $ 83,159 $ 78,028  
Common Equity Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio 7.00% 7.00% 7.00% 7.00% 7.00%  
Common Equity Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Amount $ 77,219 $ 77,219 $ 77,219 $ 77,219 $ 72,455  
Common Equity Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio 6.50% 6.50% 6.50% 6.50% 6.50%  
Tier 1 Capital (to risk-weighted assets)            
Tier 1 Capital (to risk-weighted assets), Actual Amount $ 129,482 $ 129,482 $ 129,482 $ 129,482 $ 116,783  
Tier 1 Capital (to risk-weighted assets), Actual Ratio 10.90% 10.90% 10.90% 10.90% 10.50%  
Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount $ 100,978 $ 100,978 $ 100,978 $ 100,978 $ 94,748  
Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio 8.50% 8.50% 8.50% 8.50% 8.50%  
Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Amount $ 95,038 $ 95,038 $ 95,038 $ 95,038 $ 89,175  
Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio 8.00% 8.00% 8.00% 8.00% 8.00%  
Tier 1 Capital (to average assets)            
Tier 1 Capital (to average assets), Actual Amount $ 129,482 $ 129,482 $ 129,482 $ 129,482 $ 116,783  
Tier 1 Capital (to average assets), Actual Ratio 8.60% 8.60% 8.60% 8.60% 8.10%  
Tier 1 Capital (to average assets), Required to be Adequately Capitalized, Amount $ 60,368 $ 60,368 $ 60,368 $ 60,368 $ 57,833  
Tier 1 Capital (to average assets), Required to be Adequately Capitalized, Ratio 4.00% 4.00% 4.00% 4.00% 4.00%  
Tier 1 Capital (to average assets), Required to be Well Capitalized, Amount $ 75,460 $ 75,460 $ 75,460 $ 75,460 $ 72,292  
Tier 1 Capital (to average assets), Required to be Well Capitalized, Ratio 5.00% 5.00% 5.00% 5.00% 5.00%  
Mahopac            
Total Capital (to risk-weighted assets)            
Total Capital (to risk-weighted assets), Actual Amount $ 126,342 $ 126,342 $ 126,342 $ 126,342 $ 117,740  
Total Capital (to risk-weighted assets), Actual Ratio 12.70% 12.70% 12.70% 12.70% 12.10%  
Total Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount $ 104,146 $ 104,146 $ 104,146 $ 104,146 $ 102,555  
Total Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio 10.50% 10.50% 10.50% 10.50% 10.50%  
Total Capital (to risk-weighted assets), Required to be Well Capitalized, Amount $ 99,186 $ 99,186 $ 99,186 $ 99,186 $ 97,672  
Total Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio 10.00% 10.00% 10.00% 10.00% 10.00%  
Common EquityTier 1 Capital (to risk-weighted assets)            
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Amount $ 114,327 $ 114,327 $ 114,327 $ 114,327 $ 105,979  
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Ratio 11.50% 11.50% 11.50% 11.50% 10.90%  
Common Equity Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount $ 69,431 $ 69,431 $ 69,431 $ 69,431 $ 68,370  
Common Equity Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio 7.00% 7.00% 7.00% 7.00% 7.00%  
Common Equity Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Amount $ 64,471 $ 64,471 $ 64,471 $ 64,471 $ 63,487  
Common Equity Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio 6.50% 6.50% 6.50% 6.50% 6.50%  
Tier 1 Capital (to risk-weighted assets)            
Tier 1 Capital (to risk-weighted assets), Actual Amount $ 114,327 $ 114,327 $ 114,327 $ 114,327 $ 105,979  
Tier 1 Capital (to risk-weighted assets), Actual Ratio 11.50% 11.50% 11.50% 11.50% 10.90%  
Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount $ 84,309 $ 84,309 $ 84,309 $ 84,309 $ 83,021  
Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio 8.50% 8.50% 8.50% 8.50% 8.50%  
Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Amount $ 79,349 $ 79,349 $ 79,349 $ 79,349 $ 78,137  
Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio 8.00% 8.00% 8.00% 8.00% 8.00%  
Tier 1 Capital (to average assets)            
Tier 1 Capital (to average assets), Actual Amount $ 114,327 $ 114,327 $ 114,327 $ 114,327 $ 105,979  
Tier 1 Capital (to average assets), Actual Ratio 8.40% 8.40% 8.40% 8.40% 8.10%  
Tier 1 Capital (to average assets), Required to be Adequately Capitalized, Amount $ 54,219 $ 54,219 $ 54,219 $ 54,219 $ 52,463  
Tier 1 Capital (to average assets), Required to be Adequately Capitalized, Ratio 4.00% 4.00% 4.00% 4.00% 4.00%  
Tier 1 Capital (to average assets), Required to be Well Capitalized, Amount $ 67,773 $ 67,773 $ 67,773 $ 67,773 $ 65,578  
Tier 1 Capital (to average assets), Required to be Well Capitalized, Ratio 5.00% 5.00% 5.00% 5.00% 5.00%  
VIST            
Total Capital (to risk-weighted assets)            
Total Capital (to risk-weighted assets), Actual Amount $ 158,557 $ 158,557 $ 158,557 $ 158,557 $ 148,185  
Total Capital (to risk-weighted assets), Actual Ratio 11.70% 11.70% 11.70% 11.70% 11.40%  
Total Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount $ 142,048 $ 142,048 $ 142,048 $ 142,048 $ 136,518  
Total Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio 10.50% 10.50% 10.50% 10.50% 10.50%  
Total Capital (to risk-weighted assets), Required to be Well Capitalized, Amount $ 135,284 $ 135,284 $ 135,284 $ 135,284 $ 130,017  
Total Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio 10.00% 10.00% 10.00% 10.00% 10.00%  
Common EquityTier 1 Capital (to risk-weighted assets)            
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Amount $ 146,131 $ 146,131 $ 146,131 $ 146,131 $ 138,901  
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Ratio 10.80% 10.80% 10.80% 10.80% 10.70%  
Common Equity Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount $ 94,699 $ 94,699 $ 94,699 $ 94,699 $ 91,012  
Common Equity Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio 7.00% 7.00% 7.00% 7.00% 7.00%  
Common Equity Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Amount $ 87,934 $ 87,934 $ 87,934 $ 87,934 $ 84,511  
Common Equity Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio 6.50% 6.50% 6.50% 6.50% 6.50%  
Tier 1 Capital (to risk-weighted assets)            
Tier 1 Capital (to risk-weighted assets), Actual Amount $ 146,131 $ 146,131 $ 146,131 $ 146,131 $ 138,901  
Tier 1 Capital (to risk-weighted assets), Actual Ratio 10.80% 10.80% 10.80% 10.80% 10.70%  
Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount $ 114,991 $ 114,991 $ 114,991 $ 114,991 $ 110,515  
Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio 8.50% 8.50% 8.50% 8.50% 8.50%  
Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Amount $ 108,227 $ 108,227 $ 108,227 $ 108,227 $ 104,014  
Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio 8.00% 8.00% 8.00% 8.00% 8.00%  
Tier 1 Capital (to average assets)            
Tier 1 Capital (to average assets), Actual Amount $ 146,131 $ 146,131 $ 146,131 $ 146,131 $ 138,901  
Tier 1 Capital (to average assets), Actual Ratio 8.80% 8.80% 8.80% 8.80% 8.60%  
Tier 1 Capital (to average assets), Required to be Adequately Capitalized, Amount $ 66,282 $ 66,282 $ 66,282 $ 66,282 $ 64,647  
Tier 1 Capital (to average assets), Required to be Adequately Capitalized, Ratio 4.00% 4.00% 4.00% 4.00% 4.00%  
Tier 1 Capital (to average assets), Required to be Well Capitalized, Amount $ 82,853 $ 82,853 $ 82,853 $ 82,853 $ 80,809  
Tier 1 Capital (to average assets), Required to be Well Capitalized, Ratio 5.00% 5.00% 5.00% 5.00% 5.00%  
The Company (consolidated)            
Total Capital (to risk-weighted assets)            
Total Capital (to risk-weighted assets), Actual Amount $ 645,891 $ 645,891 $ 645,891 $ 645,891 $ 585,013  
Total Capital (to risk-weighted assets), Actual Ratio 13.10% 13.10% 13.10% 13.10% 12.30%  
Total Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount $ 517,500 $ 517,500 $ 517,500 $ 517,500 $ 500,676  
Total Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio 10.50% 10.50% 10.50% 10.50% 10.50%  
Total Capital (to risk-weighted assets), Required to be Well Capitalized, Amount $ 492,857 $ 492,857 $ 492,857 $ 492,857 $ 476,835  
Total Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio 10.00% 10.00% 10.00% 10.00% 10.00%  
Common EquityTier 1 Capital (to risk-weighted assets)            
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Amount $ 583,458 $ 583,458 $ 583,458 $ 583,458 $ 526,822  
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Ratio 11.80% 11.80% 11.80% 11.80% 11.10%  
Common Equity Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount $ 345,000 $ 345,000 $ 345,000 $ 345,000 $ 333,784  
Common Equity Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio 7.00% 7.00% 7.00% 7.00% 7.00%  
Common Equity Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Amount $ 320,357 $ 320,357 $ 320,357 $ 320,357 $ 309,943  
Common Equity Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio 6.50% 6.50% 6.50% 6.50% 6.50%  
Tier 1 Capital (to risk-weighted assets)            
Tier 1 Capital (to risk-weighted assets), Actual Amount $ 600,321 $ 600,321 $ 600,321 $ 600,321 $ 543,514  
Tier 1 Capital (to risk-weighted assets), Actual Ratio 12.20% 12.20% 12.20% 12.20% 11.40%  
Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount $ 418,929 $ 418,929 $ 418,929 $ 418,929 $ 405,310  
Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio 8.50% 8.50% 8.50% 8.50% 8.50%  
Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Amount $ 394,286 $ 394,286 $ 394,286 $ 394,286 $ 381,468  
Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio 8.00% 8.00% 8.00% 8.00% 8.00%  
Tier 1 Capital (to average assets)            
Tier 1 Capital (to average assets), Actual Amount $ 600,321 $ 600,321 $ 600,321 $ 600,321 $ 543,514  
Tier 1 Capital (to average assets), Actual Ratio 9.10% 9.10% 9.10% 9.10% 8.40%  
Tier 1 Capital (to average assets), Required to be Adequately Capitalized, Amount $ 265,465 $ 265,465 $ 265,465 $ 265,465 $ 257,887  
Tier 1 Capital (to average assets), Required to be Adequately Capitalized, Ratio 4.00% 4.00% 4.00% 4.00% 4.00%  
Tier 1 Capital (to average assets), Required to be Well Capitalized, Amount $ 331,832 $ 331,832 $ 331,832 $ 331,832 $ 322,359  
Tier 1 Capital (to average assets), Required to be Well Capitalized, Ratio 5.00% 5.00% 5.00% 5.00% 5.00%  
Trust Company            
Total Capital (to risk-weighted assets)            
Total Capital (to risk-weighted assets), Actual Amount $ 191,872 $ 191,872 $ 191,872 $ 191,872 $ 171,774  
Total Capital (to risk-weighted assets), Actual Ratio 13.90% 13.90% 13.90% 13.90% 12.50%  
Total Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount $ 144,822 $ 144,822 $ 144,822 $ 144,822 $ 144,235  
Total Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio 10.50% 10.50% 10.50% 10.50% 10.50%  
Total Capital (to risk-weighted assets), Required to be Well Capitalized, Amount $ 137,926 $ 137,926 $ 137,926 $ 137,926 $ 137,366  
Total Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio 10.00% 10.00% 10.00% 10.00% 10.00%  
Common EquityTier 1 Capital (to risk-weighted assets)            
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Amount $ 180,077 $ 180,077 $ 180,077 $ 180,077 $ 160,047  
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Ratio 13.10% 13.10% 13.10% 13.10% 11.70%  
Common Equity Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount $ 96,548 $ 96,548 $ 96,548 $ 96,548 $ 96,156  
Common Equity Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio 7.00% 7.00% 7.00% 7.00% 7.00%  
Common Equity Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Amount $ 89,652 $ 89,652 $ 89,652 $ 89,652 $ 89,288  
Common Equity Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio 6.50% 6.50% 6.50% 6.50% 6.50%  
Tier 1 Capital (to risk-weighted assets)            
Tier 1 Capital (to risk-weighted assets), Actual Amount $ 180,077 $ 180,077 $ 180,077 $ 180,077 $ 160,047  
Tier 1 Capital (to risk-weighted assets), Actual Ratio 13.10% 13.10% 13.10% 13.10% 11.70%  
Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount $ 117,237 $ 117,237 $ 117,237 $ 117,237 $ 116,761  
Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio 8.50% 8.50% 8.50% 8.50% 8.50%  
Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Amount $ 110,341 $ 110,341 $ 110,341 $ 110,341 $ 109,893  
Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio 8.00% 8.00% 8.00% 8.00% 8.00%  
Tier 1 Capital (to average assets)            
Tier 1 Capital (to average assets), Actual Amount $ 180,077 $ 180,077 $ 180,077 $ 180,077 $ 160,047  
Tier 1 Capital (to average assets), Actual Ratio 8.50% 8.50% 8.50% 8.50% 7.80%  
Tier 1 Capital (to average assets), Required to be Adequately Capitalized, Amount $ 84,592 $ 84,592 $ 84,592 $ 84,592 $ 82,425  
Tier 1 Capital (to average assets), Required to be Adequately Capitalized, Ratio 4.00% 4.00% 4.00% 4.00% 4.00%  
Tier 1 Capital (to average assets), Required to be Well Capitalized, Amount $ 105,740 $ 105,740 $ 105,740 $ 105,740 $ 103,031  
Tier 1 Capital (to average assets), Required to be Well Capitalized, Ratio 5.00% 5.00% 5.00% 5.00% 5.00%  
Retained Earnings            
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]            
Reclassification from accumulated other comprehensive income (loss) to retained earnings $ 10,000