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Loans and Allowance for Credit Losses - Amortized cost basis of collateral-dependent loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable, net	$ 7,650,633	$ 7,472,090
Business or Other Assets
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable, net	14,519
Business or Other Assets | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable, net	11,326
Business or Other Assets | PPP loans
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable, net	0
Business or Other Assets | Income producing - commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable, net	3,193
Business or Other Assets | Owner occupied - commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable, net	0
Business or Other Assets | Real estate mortgage - residential
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable, net	0
Business or Other Assets | Construction - commercial and residential
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable, net	0
Business or Other Assets | Home equity
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable, net	0
Business or Other Assets | Other consumer
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable, net	0
Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable, net	46,424
Real Estate | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable, net	4,026
Real Estate | PPP loans
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable, net	0
Real Estate | Income producing - commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable, net	15,686
Real Estate | Owner occupied - commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable, net	23,159
Real Estate | Real estate mortgage - residential
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable, net	2,932
Real Estate | Construction - commercial and residential
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable, net	206
Real Estate | Home equity
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable, net	415
Real Estate | Other consumer
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable, net	$ 0

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Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-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

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