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Loans and Allowance for Credit Losses - Schedule of Nonaccrual Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	$ 111,586	$ 147,339
Nonaccrual With No Related Allowance	30,373	25,618
Past Due 90 Days or More and Accruing	113	167
Commercial
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	26,534	34,895
Nonaccrual With No Related Allowance	2,617	3,394
Past Due 90 Days or More and Accruing	96	122
Commercial real estate
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	55,210	76,138
Nonaccrual With No Related Allowance	27,756	22,152
Past Due 90 Days or More and Accruing	0	20
BBCC
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	3,621	3,551
Nonaccrual With No Related Allowance	0	0
Past Due 90 Days or More and Accruing	0	0
Residential real estate
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	18,943	24,794
Nonaccrual With No Related Allowance	0	0
Past Due 90 Days or More and Accruing	0	0
Indirect
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	2,445	2,529
Nonaccrual With No Related Allowance	0	0
Past Due 90 Days or More and Accruing	0	12
Direct
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	1,195	1,178
Nonaccrual With No Related Allowance	0	27
Past Due 90 Days or More and Accruing	17	13
Home equity
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	3,638	4,254
Nonaccrual With No Related Allowance	0	45
Past Due 90 Days or More and Accruing	$ 0	$ 0

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- Definition

Amount of financing receivable on nonaccrual status with no allowance for credit loss.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
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