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Loans and Allowance for Credit Losses - Amortized cost basis of collateral-dependent loans (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Loans and Leases Receivable Disclosure [Line Items]
PPP loans, net	$ 7,042,302	$ 6,990,633
Business or Other Assets
Loans and Leases Receivable Disclosure [Line Items]
PPP loans, net	5,448	7,656
Business or Other Assets | Commercial
Loans and Leases Receivable Disclosure [Line Items]
PPP loans, net	2,222	3,098
Business or Other Assets | PPP loans
Loans and Leases Receivable Disclosure [Line Items]
PPP loans, net	106	1,365
Business or Other Assets | Income-producing - commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
PPP loans, net	3,120	3,193
Business or Other Assets | Owner-occupied - commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
PPP loans, net	0	0
Business or Other Assets | Real estate mortgage - residential
Loans and Leases Receivable Disclosure [Line Items]
PPP loans, net	0	0
Business or Other Assets | Construction - commercial and residential
Loans and Leases Receivable Disclosure [Line Items]
PPP loans, net	0	0
Business or Other Assets | Home equity
Loans and Leases Receivable Disclosure [Line Items]
PPP loans, net	0	0
Real Estate
Loans and Leases Receivable Disclosure [Line Items]
PPP loans, net	28,196	31,479
Real Estate | Commercial
Loans and Leases Receivable Disclosure [Line Items]
PPP loans, net	6,784	6,821
Real Estate | PPP loans
Loans and Leases Receivable Disclosure [Line Items]
PPP loans, net	0	0
Real Estate | Income-producing - commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
PPP loans, net	19,316	19,378
Real Estate | Owner-occupied - commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
PPP loans, net	33	42
Real Estate | Real estate mortgage - residential
Loans and Leases Receivable Disclosure [Line Items]
PPP loans, net	1,698	1,779
Real Estate | Construction - commercial and residential
Loans and Leases Receivable Disclosure [Line Items]
PPP loans, net	0	3,093
Real Estate | Home equity
Loans and Leases Receivable Disclosure [Line Items]
PPP loans, net	$ 365	$ 366

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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=124255953&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=124259787&loc=d3e4428-111522

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