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Loans and Allowance for Loan Losses (Activity in Allowance for Loan Losses by Portfolio Segment) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Beginning balance |  | $ 24,712,000 | $ 24,171,000 | $ 23,116,000
Loans charged off |  | (2,713,000) | (2,248,000) | (2,468,000)
Recoveries |  | 310,000 | 1,944,000 | 497,000
Provision (credit) | [1] | 2,862,000 | 845,000 | 3,026,000
Ending balance |  | 25,171,000 | 24,712,000 | 24,171,000
Ending Balance: Individually evaluated for impairment |  | 463,000 | 824,000 | 2,009,000
Ending Balance: Collectively evaluated for impairment |  | 24,708,000 | 23,888,000 | 22,162,000
Ending Balance: Individually evaluated for impairment |  | 4,478,000 | 6,926,000 | 13,590,000
Ending Balance: Collectively evaluated for impairment |  | 3,090,545,000 | 3,019,296,000 | 2,768,849,000
Total loan balances |  | 3,095,023,000 | 3,026,222,000 | 2,782,439,000
Reserve for unfunded commitments |  | 21,000 | 22,000 | 20,000
Residential real estate |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Beginning balance |  | 6,071,000 | 5,086,000 | 4,160,000
Loans charged off |  | (462,000) | (173,000) | (482,000)
Recoveries |  | 16,000 | 90,000 | 30,000
Provision (credit) | [1] | 217,000 | 1,068,000 | 1,378,000
Ending balance |  | 5,842,000 | 6,071,000 | 5,086,000
Ending Balance: Individually evaluated for impairment |  | 364,000 | 586,000 | 568,000
Ending Balance: Collectively evaluated for impairment |  | 5,478,000 | 5,485,000 | 4,518,000
Ending Balance: Individually evaluated for impairment |  | 3,384,000 | 4,762,000 | 5,171,000
Ending Balance: Collectively evaluated for impairment |  | 1,066,990,000 | 988,104,000 | 853,198,000
Total loan balances |  | 1,070,374,000 | 992,866,000 | 858,369,000
Commercial real estate |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Beginning balance |  | 11,654,000 | 11,863,000 | 12,154,000
Loans charged off |  | (300,000) | (512,000) | (124,000)
Recoveries |  | 49,000 | 28,000 | 141,000
Provision (credit) | [1] | 1,011,000 | 275,000 | (308,000)
Ending balance |  | 12,414,000 | 11,654,000 | 11,863,000
Ending Balance: Individually evaluated for impairment |  | 30,000 | 23,000 | 1,441,000
Ending Balance: Collectively evaluated for impairment |  | 12,384,000 | 11,631,000 | 10,422,000
Ending Balance: Individually evaluated for impairment |  | 402,000 | 930,000 | 6,199,000
Ending Balance: Collectively evaluated for impairment |  | 1,242,995,000 | 1,268,603,000 | 1,157,824,000
Total loan balances |  | 1,243,397,000 | 1,269,533,000 | 1,164,023,000
Commercial |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Beginning balance |  | 3,620,000 | 4,171,000 | 3,755,000
Loans charged off |  | (1,167,000) | (736,000) | (1,014,000)
Recoveries |  | 225,000 | 1,770,000 | 301,000
Provision (credit) | [1] | 1,091,000 | (1,585,000) | 1,129,000
Ending balance |  | 3,769,000 | 3,620,000 | 4,171,000
Ending Balance: Individually evaluated for impairment |  |  | 53,000 |
Ending Balance: Collectively evaluated for impairment |  | 3,769,000 | 3,567,000 | 4,171,000
Ending Balance: Individually evaluated for impairment |  | 319,000 | 786,000 | 1,791,000
Ending Balance: Collectively evaluated for impairment |  | 420,789,000 | 380,994,000 | 371,609,000
Total loan balances |  | 421,108,000 | 381,780,000 | 373,400,000
Home equity |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Beginning balance |  | 2,796,000 | 2,367,000 | 2,194,000
Loans charged off |  | (412,000) | (476,000) | (434,000)
Recoveries |  | 1,000 | 44,000 | 2,000
Provision (credit) | [1] | 38,000 | 861,000 | 605,000
Ending balance |  | 2,423,000 | 2,796,000 | 2,367,000
Ending Balance: Individually evaluated for impairment |  | 69,000 | 162,000 |
Ending Balance: Collectively evaluated for impairment |  | 2,354,000 | 2,634,000 | 2,367,000
Ending Balance: Individually evaluated for impairment |  | 373,000 | 442,000 | 429,000
Ending Balance: Collectively evaluated for impairment |  | 312,406,000 | 327,321,000 | 322,949,000
Total loan balances |  | 312,779,000 | 327,763,000 | 323,378,000
Consumer |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Beginning balance |  | 234,000 | 233,000 | 181,000
Loans charged off |  | (301,000) | (96,000) | (124,000)
Recoveries |  | 19,000 | 11,000 | 17,000
Provision (credit) | [1] | 555,000 | 86,000 | 159,000
Ending balance |  | 507,000 | 234,000 | 233,000
Ending Balance: Collectively evaluated for impairment |  | 507,000 | 234,000 | 233,000
Ending Balance: Individually evaluated for impairment |  |  | 6,000 |
Ending Balance: Collectively evaluated for impairment |  | 25,772,000 | 20,618,000 | 18,149,000
Total loan balances |  | 25,772,000 | 20,624,000 | 18,149,000
HPFC Portfolio Segment |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Beginning balance |  | 337,000 | 451,000 | 672,000
Loans charged off |  | (71,000) | (255,000) | (290,000)
Recoveries |  |  | 1,000 | 6,000
Provision (credit) | [1] | (50,000) | 140,000 | 63,000
Ending balance |  | 216,000 | 337,000 | 451,000
Ending Balance: Collectively evaluated for impairment |  | 216,000 | 337,000 | 451,000
Ending Balance: Collectively evaluated for impairment |  | 21,593,000 | 33,656,000 | 45,120,000
Total loan balances |  | $ 21,593,000 | $ 33,656,000 | $ 45,120,000
[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, 2019, 2018, and 2017, the reserve for unfunded commitments was $21,000, $22,000 and $20,000, respectively.

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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