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Loans (Changes in the Allowance for Credit Losses) (Details) - USD ($) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Dec. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance, prior to adoption of ASC 326 | $ 30,482 | $ 43,356 |
Impact of adopting ASC 326 | 9,594 |  |
Allowance for loan losses, Beginning balance |  | 40,076 | $ 33,914
Allowance for loan losses, Charge-offs |  | (12,032) | (3,452)
Allowance for loan losses, Recoveries |  | 1,889 | 1,672
Allowance for loan losses, Provision (credit) |  | 13,423 | 1,193
Allowance for loan losses, Ending balance | 40,076 | 43,356 | 33,327
Allowance for loan losses, Individually Evaluated for impairment |  |  | 183
Allowance for loan losses, Collectively Evaluated for impairment |  |  | 33,144
Loans, Ending balance | 3,179,465 | 3,195,175 | 3,066,996
Allowance for loan losses, Individually Evaluated for impairment |  |  | 2,077
Allowance for loan losses, Collectively Evaluated for impairment |  |  | 3,064,919
Commercial Business [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance, prior to adoption of ASC 326 | 11,358 |  |
Impact of adopting ASC 326 | (246) |  |
Allowance for loan losses, Beginning balance |  | 11,112 | 14,312
Allowance for loan losses, Charge-offs |  | (8,241) | (130)
Allowance for loan losses, Recoveries |  | 58 | 103
Allowance for loan losses, Provision (credit) |  | 7,294 | (2,118)
Allowance for loan losses, Ending balance | 11,112 | 10,223 | 12,167
Allowance for loan losses, Individually Evaluated for impairment |  |  | 181
Allowance for loan losses, Collectively Evaluated for impairment |  |  | 11,986
Loans, Ending balance | 571,222 | 587,903 | 552,834
Allowance for loan losses, Individually Evaluated for impairment |  |  | 725
Allowance for loan losses, Collectively Evaluated for impairment |  |  | 552,109
Commercial Mortgage [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance, prior to adoption of ASC 326 | 5,681 |  |
Impact of adopting ASC 326 | 7,310 |  |
Allowance for loan losses, Beginning balance |  | 12,991 | 5,219
Allowance for loan losses, Charge-offs |  | 0 | 0
Allowance for loan losses, Recoveries |  | 0 | 17
Allowance for loan losses, Provision (credit) |  | 2,163 | 1,080
Allowance for loan losses, Ending balance | 12,991 | 15,154 | 6,316
Allowance for loan losses, Individually Evaluated for impairment |  |  | 2
Allowance for loan losses, Collectively Evaluated for impairment |  |  | 6,314
Loans, Ending balance | 1,108,315 | 1,109,344 | 995,183
Allowance for loan losses, Individually Evaluated for impairment |  |  | 1,352
Allowance for loan losses, Collectively Evaluated for impairment |  |  | 993,831
Residential Real Estate Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance, prior to adoption of ASC 326 | 1,059 |  |
Impact of adopting ASC 326 | 3,290 |  |
Allowance for loan losses, Beginning balance |  | 4,349 | 1,112
Allowance for loan losses, Charge-offs |  | (98) | (31)
Allowance for loan losses, Recoveries |  | 10 | 6
Allowance for loan losses, Provision (credit) |  | 1,909 | 178
Allowance for loan losses, Ending balance | 4,349 | 6,170 | 1,265
Allowance for loan losses, Individually Evaluated for impairment |  |  | 0
Allowance for loan losses, Collectively Evaluated for impairment |  |  | 1,265
Loans, Ending balance | 560,717 | 567,714 | 525,036
Allowance for loan losses, Individually Evaluated for impairment |  |  | 0
Allowance for loan losses, Collectively Evaluated for impairment |  |  | 525,036
Residential Real Estate Lines [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance, prior to adoption of ASC 326 | 118 |  |
Impact of adopting ASC 326 | 607 |  |
Allowance for loan losses, Beginning balance |  | 725 | 210
Allowance for loan losses, Charge-offs |  | 0 | 0
Allowance for loan losses, Recoveries |  | 3 | 2
Allowance for loan losses, Provision (credit) |  | 171 | (39)
Allowance for loan losses, Ending balance | 725 | 899 | 173
Allowance for loan losses, Individually Evaluated for impairment |  |  | 0
Allowance for loan losses, Collectively Evaluated for impairment |  |  | 173
Loans, Ending balance | 101,048 | 98,996 | 105,592
Allowance for loan losses, Individually Evaluated for impairment |  |  | 0
Allowance for loan losses, Collectively Evaluated for impairment |  |  | 105,592
Consumer Indirect [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance, prior to adoption of ASC 326 | 11,852 |  |
Impact of adopting ASC 326 | (1,234) |  |
Allowance for loan losses, Beginning balance |  | 10,618 | 12,572
Allowance for loan losses, Charge-offs |  | (3,424) | (2,982)
Allowance for loan losses, Recoveries |  | 1,668 | 1,424
Allowance for loan losses, Provision (credit) |  | 1,783 | 2,011
Allowance for loan losses, Ending balance | 10,618 | 10,645 | 13,025
Allowance for loan losses, Individually Evaluated for impairment |  |  | 0
Allowance for loan losses, Collectively Evaluated for impairment |  |  | 13,025
Loans, Ending balance | 822,179 | 815,969 | 872,410
Allowance for loan losses, Individually Evaluated for impairment |  |  | 0
Allowance for loan losses, Collectively Evaluated for impairment |  |  | 872,410
Other Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance, prior to adoption of ASC 326 | 414 |  |
Impact of adopting ASC 326 | (133) |  |
Allowance for loan losses, Beginning balance |  | 281 | 489
Allowance for loan losses, Charge-offs |  | (269) | (309)
Allowance for loan losses, Recoveries |  | 150 | 120
Allowance for loan losses, Provision (credit) |  | 103 | 81
Allowance for loan losses, Ending balance | 281 | 265 | 381
Allowance for loan losses, Individually Evaluated for impairment |  |  | 0
Allowance for loan losses, Collectively Evaluated for impairment |  |  | 381
Loans, Ending balance | $ 15,984 | $ 15,249 | 15,941
Allowance for loan losses, Individually Evaluated for impairment |  |  | 0
Allowance for loan losses, Collectively Evaluated for impairment |  |  | $ 15,941

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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=118936363&loc=SL6953423-111524 Reference 2: 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=118955202&loc=SL82895884-210446 Reference 3: 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=119407570&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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=119407570&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=118936363&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=118936363&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + 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=118955255&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: 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=119407570&loc=SL82919249-210447 Reference 4: 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=118936363&loc=SL6953423-111524 + Details
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- Definition Amount of credit loss expense (reversal of expense) for financing receivable from change in methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 11 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919244-210447 + Details
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- Definition The balance of financing receivables 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 (h) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: 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=118936363&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 Reference 4: 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=118936363&loc=SL6953423-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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