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Loans and Allowance for Credit Losses on Loans (Activity in Allowance for Loan Losses by Portfolio Segment) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning balance | $ 25,171 | $ 24,712 | $ 24,171
Loans charged off | (1,838) | (2,713) | (2,248)
Recoveries | 1,084 | 310 | 1,944
Provision (credit) | 13,215 | 2,862 | 845
Ending balance | 37,865 | 25,171 | 24,712
Ending Balance: Individually evaluated for impairment |  | 463 | 824
Ending Balance: Collectively evaluated for impairment |  | 24,708 | 23,888
Ending Balance: Individually evaluated for impairment |  | 4,478 | 6,926
Ending Balance: Collectively evaluated for impairment |  | 3,090,545 | 3,019,296
Total loan balances | 3,219,822 | 3,095,023 | 3,026,222
Residential real estate |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning balance | 5,842 | 6,071 | 5,086
Loans charged off | (121) | (462) | (173)
Recoveries | 292 | 16 | 90
Provision (credit) | (1,410) | 217 | 1,068
Ending balance | 3,474 | 5,842 | 6,071
Ending Balance: Individually evaluated for impairment |  | 364 | 586
Ending Balance: Collectively evaluated for impairment |  | 5,478 | 5,485
Ending Balance: Individually evaluated for impairment |  | 3,384 | 4,762
Ending Balance: Collectively evaluated for impairment |  | 1,066,990 | 988,104
Total loan balances | 1,054,798 | 1,070,374 | 992,866
Commercial real estate |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning balance | 12,414 | 11,654 | 11,863
Loans charged off |  | (300) | (512)
Recoveries |  | 49 | 28
Provision (credit) |  | 1,011 | 275
Ending balance |  | 12,414 | 11,654
Ending Balance: Individually evaluated for impairment |  | 30 | 23
Ending Balance: Collectively evaluated for impairment |  | 12,384 | 11,631
Ending Balance: Individually evaluated for impairment |  | 402 | 930
Ending Balance: Collectively evaluated for impairment |  | 1,242,995 | 1,268,603
Total loan balances |  | 1,243,397 | 1,269,533
Commercial |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning balance | 3,985 | 3,957 | 4,622
Loans charged off | (1,130) | (1,238) | (991)
Recoveries | 572 | 225 | 1,771
Provision (credit) | 1,728 | 1,041 | (1,445)
Ending balance | 6,703 | 3,985 | 3,957
Ending Balance: Individually evaluated for impairment |  |  | 53
Ending Balance: Collectively evaluated for impairment |  | 3,985 | 3,904
Ending Balance: Individually evaluated for impairment |  | 319 | 786
Ending Balance: Collectively evaluated for impairment |  | 442,382 | 414,650
Total loan balances | 381,494 | 442,701 | 415,436
Home equity |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning balance | 2,423 | 2,796 | 2,367
Loans charged off | (317) | (412) | (476)
Recoveries | 33 | 1 | 44
Provision (credit) | (315) | 38 | 861
Ending balance | 2,616 | 2,423 | 2,796
Ending Balance: Individually evaluated for impairment |  | 69 | 162
Ending Balance: Collectively evaluated for impairment |  | 2,354 | 2,634
Ending Balance: Individually evaluated for impairment |  | 373 | 442
Ending Balance: Collectively evaluated for impairment |  | 312,406 | 327,321
Total loan balances | 258,573 | 312,779 | 327,763
Consumer |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning balance | 507 | 234 | 233
Loans charged off | (167) | (301) | (96)
Recoveries | 67 | 19 | 11
Provision (credit) | 206 | 555 | 86
Ending balance | 393 | 507 | 234
Ending Balance: Collectively evaluated for impairment |  | 507 | 234
Ending Balance: Individually evaluated for impairment |  |  | 6
Ending Balance: Collectively evaluated for impairment |  | 25,772 | 20,618
Total loan balances | $ 20,392 | $ 25,772 | $ 20,624

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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + 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=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + 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 (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + 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 (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition Amount of increase in allowance for credit loss on financing receivable from recovery. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524 + Details
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