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Loans and Allowance for Loan Losses (Activity in Allowance for Loan Losses by Portfolio Segment) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning balance $ 24,171,000 $ 23,116,000 $ 21,166,000
Loans charged off (2,248,000) (2,468,000) (3,805,000)
Recoveries 1,944,000 497,000 486,000
Provision (credit)(1) [1] 845,000 3,026,000 5,269,000
Ending balance 24,712,000 24,171,000 23,116,000
Ending Balance: Individually evaluated for impairment 824,000 2,009,000 2,007,000
Ending Balance: Collectively evaluated for impairment 23,888,000 22,162,000 21,109,000
Ending Balance: Individually evaluated for impairment 6,926,000 13,590,000 20,254,000
Ending Balance: Collectively evaluated for impairment 3,019,296,000 2,768,849,000 2,574,310,000
Total loan balances 3,026,222,000 2,782,439,000 2,594,564,000
Reserve for unfunded commitments 22,000 20,000 11,000
Residential real estate loans      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning balance 5,086,000 4,160,000 4,545,000
Loans charged off (173,000) (482,000) (356,000)
Recoveries 90,000 30,000 95,000
Provision (credit)(1) [1] 1,068,000 1,378,000 (124,000)
Ending balance 6,071,000 5,086,000 4,160,000
Ending Balance: Individually evaluated for impairment 586,000 568,000 483,000
Ending Balance: Collectively evaluated for impairment 5,485,000 4,518,000 3,677,000
Ending Balance: Individually evaluated for impairment 4,762,000 5,171,000 4,348,000
Ending Balance: Collectively evaluated for impairment 988,104,000 853,198,000 798,146,000
Total loan balances 992,866,000 858,369,000 802,494,000
Commercial real estate loans      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning balance 11,863,000 12,154,000 10,432,000
Loans charged off (512,000) (124,000) (315,000)
Recoveries 28,000 141,000 50,000
Provision (credit)(1) [1] 275,000 (308,000) 1,987,000
Ending balance 11,654,000 11,863,000 12,154,000
Ending Balance: Individually evaluated for impairment 23,000 1,441,000 1,373,000
Ending Balance: Collectively evaluated for impairment 11,631,000 10,422,000 10,781,000
Ending Balance: Individually evaluated for impairment 930,000 6,199,000 13,317,000
Ending Balance: Collectively evaluated for impairment 1,268,603,000 1,157,824,000 1,037,463,000
Total loan balances 1,269,533,000 1,164,023,000 1,050,780,000
Commercial loans      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning balance 4,171,000 3,755,000 3,241,000
Loans charged off (736,000) (1,014,000) (2,218,000)
Recoveries 1,770,000 301,000 332,000
Provision (credit)(1) [1] (1,585,000) 1,129,000 2,400,000
Ending balance 3,620,000 4,171,000 3,755,000
Ending Balance: Individually evaluated for impairment 53,000    
Ending Balance: Collectively evaluated for impairment 3,567,000 4,171,000 3,755,000
Ending Balance: Individually evaluated for impairment 786,000 1,791,000 2,028,000
Ending Balance: Collectively evaluated for impairment 380,994,000 371,609,000 331,611,000
Total loan balances 381,780,000 373,400,000 333,639,000
Home equity loans      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning balance 2,367,000 2,194,000 2,731,000
Loans charged off (476,000) (434,000) (308,000)
Recoveries 44,000 2,000 2,000
Provision (credit)(1) [1] 861,000 605,000 (231,000)
Ending balance 2,796,000 2,367,000 2,194,000
Ending Balance: Individually evaluated for impairment 162,000   86,000
Ending Balance: Collectively evaluated for impairment 2,634,000 2,367,000 2,108,000
Ending Balance: Individually evaluated for impairment 442,000 429,000 457,000
Ending Balance: Collectively evaluated for impairment 327,321,000 322,949,000 329,450,000
Total loan balances 327,763,000 323,378,000 329,907,000
Consumer loans      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning balance 233,000 181,000 193,000
Loans charged off (96,000) (124,000) (101,000)
Recoveries 11,000 17,000 7,000
Provision (credit)(1) [1] 86,000 159,000 82,000
Ending balance 234,000 233,000 181,000
Ending Balance: Collectively evaluated for impairment 234,000 233,000 181,000
Ending Balance: Individually evaluated for impairment 6,000   7,000
Ending Balance: Collectively evaluated for impairment 20,618,000 18,149,000 17,325,000
Total loan balances 20,624,000 18,149,000 17,332,000
HPFC Portfolio Segment [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning balance 451,000 672,000 24,000
Loans charged off (255,000) (290,000) (507,000)
Recoveries 1,000 6,000  
Provision (credit)(1) [1] 140,000 63,000 1,155,000
Ending balance 337,000 451,000 672,000
Ending Balance: Individually evaluated for impairment     65,000
Ending Balance: Collectively evaluated for impairment 337,000 451,000 607,000
Ending Balance: Individually evaluated for impairment     97,000
Ending Balance: Collectively evaluated for impairment 33,656,000 45,120,000 60,315,000
Total loan balances $ 33,656,000 $ 45,120,000 $ 60,412,000
[1] (1) The provision (credit) for loan losses excludes any impact for the change in the reserve for unfunded commitments, which represents management's estimate of the amount required to reflect the probable inherent losses on outstanding letters of credit and unused lines of credit. The reserve for unfunded commitments was presented within accrued interest and other liabilities on the consolidated statements of condition. At December 31, 2018, 2017, and 2016, the reserve for unfunded commitments was $22,000, $20,000 and $11,000, respectively.