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Loans and Allowance for Credit Losses - Schedule of Nonaccrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	$ 147,339	$ 137,611	$ 132,431	$ 126,412
Nonaccrual With No Related Allowance	25,618
Past Due 90 Days or More and Accruing	167
Commercial
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	34,895	34,188	40,103	39,036
Nonaccrual With No Related Allowance	3,394
Past Due 90 Days or More and Accruing	122
Commercial real estate
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	76,138	67,859	58,350
Nonaccrual With No Related Allowance	22,152
Past Due 90 Days or More and Accruing	20
BBCC
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	3,551	3,601	4,530
Nonaccrual With No Related Allowance	0
Past Due 90 Days or More and Accruing	0
Residential real estate
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	24,794	23,914	20,970	$ 21,023
Nonaccrual With No Related Allowance	0
Past Due 90 Days or More and Accruing	0
Indirect
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	2,529	2,619	3,318
Nonaccrual With No Related Allowance	0
Past Due 90 Days or More and Accruing	12
Direct
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	1,178	1,264	1,303
Nonaccrual With No Related Allowance	27
Past Due 90 Days or More and Accruing	13
Home equity
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	4,254	$ 4,166	$ 3,857
Nonaccrual With No Related Allowance	45
Past Due 90 Days or More and Accruing	$ 0

X

- 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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