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Significant Accounting Policies - Impact of Topic 326 (Details) - Accounting Standards Update 2016-13 $ in Thousands	Jan. 01, 2020 USD ($)
Assets
Portfolio Loans, allowance for loan losses (in dollars)	$ 53,748
Cumulative Effect, Period of Adoption, Adjusted Balance
Assets
Portfolio Loans, allowance for loan losses (in dollars)	70,581
Liabilities
Reserve for off-balance-sheet credit exposures	5,492
Cumulative Effect, Period of Adoption, Adjustment
Assets
Portfolio Loans, allowance for loan losses (in dollars)	16,833
Liabilities
Reserve for off-balance-sheet credit exposures	5,492
Commercial Loans
Assets
Portfolio Loans, allowance for loan losses (in dollars)	18,291
Commercial Loans | Cumulative Effect, Period of Adoption, Adjusted Balance
Assets
Portfolio Loans, allowance for loan losses (in dollars)	19,006
Commercial Loans | Cumulative Effect, Period of Adoption, Adjustment
Assets
Portfolio Loans, allowance for loan losses (in dollars)	715
Commercial Real Estate Loans
Assets
Portfolio Loans, allowance for loan losses (in dollars)	21,190
Commercial Real Estate Loans | Cumulative Effect, Period of Adoption, Adjusted Balance
Assets
Portfolio Loans, allowance for loan losses (in dollars)	30,496
Commercial Real Estate Loans | Cumulative Effect, Period of Adoption, Adjustment
Assets
Portfolio Loans, allowance for loan losses (in dollars)	9,306
Real Estate Construction
Assets
Portfolio Loans, allowance for loan losses (in dollars)	3,204
Real Estate Construction | Cumulative Effect, Period of Adoption, Adjusted Balance
Assets
Portfolio Loans, allowance for loan losses (in dollars)	6,158
Real Estate Construction | Cumulative Effect, Period of Adoption, Adjustment
Assets
Portfolio Loans, allowance for loan losses (in dollars)	2,954
Retail Real Estate
Assets
Portfolio Loans, allowance for loan losses (in dollars)	10,495
Retail Real Estate | Cumulative Effect, Period of Adoption, Adjusted Balance
Assets
Portfolio Loans, allowance for loan losses (in dollars)	13,787
Retail Real Estate | Cumulative Effect, Period of Adoption, Adjustment
Assets
Portfolio Loans, allowance for loan losses (in dollars)	3,292
Retail Other
Assets
Portfolio Loans, allowance for loan losses (in dollars)	568
Retail Other | Cumulative Effect, Period of Adoption, Adjusted Balance
Assets
Portfolio Loans, allowance for loan losses (in dollars)	1,134
Retail Other | Cumulative Effect, Period of Adoption, Adjustment
Assets
Portfolio Loans, allowance for loan losses (in dollars)	$ 566

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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 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)(1)(ii)
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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524

Reference 4: 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

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Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 2
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