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Allowance for Credit Losses - Recorded Investment in Consumer Loan Classes by Performing and Nonperforming Status (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans held for investment, outstanding balance $ 7,225,860 $ 7,137,152
Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans held for investment, outstanding balance $ 1,248,217 $ 1,380,181
Percentage of Total   100.00%
Consumer | Performing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Percentage of Total   99.40%
Consumer | Nonperforming    
Financing Receivable, Credit Quality Indicator [Line Items]    
Percentage of Total   0.60%
Consumer | Residential mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans held for investment, outstanding balance   $ 998,585
Percentage of Total   100.00%
Consumer | Residential mortgage | Performing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans held for investment, outstanding balance   $ 991,066
Percentage of Total   99.20%
Consumer | Residential mortgage | Nonperforming    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans held for investment, outstanding balance   $ 7,519
Percentage of Total   0.80%
Consumer | Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans held for investment, outstanding balance   $ 538,348
Percentage of Total   100.00%
Consumer | Home equity | Performing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans held for investment, outstanding balance   $ 535,709
Percentage of Total   99.50%
Consumer | Home equity | Nonperforming    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans held for investment, outstanding balance   $ 2,639
Percentage of Total   0.50%
Consumer | Installment and other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans held for investment, outstanding balance   $ 79,033
Percentage of Total   100.00%
Consumer | Installment and other consumer | Performing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans held for investment, outstanding balance   $ 78,993
Percentage of Total   99.90%
Consumer | Installment and other consumer | Nonperforming    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans held for investment, outstanding balance   $ 40
Percentage of Total   0.10%
Consumer | Commercial construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans held for investment, outstanding balance   $ 8,390
Percentage of Total   100.00%
Consumer | Commercial construction | Performing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans held for investment, outstanding balance   $ 8,390
Percentage of Total   100.00%
Consumer | Commercial construction | Nonperforming    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans held for investment, outstanding balance   $ 0
Percentage of Total   0.00%
Consumer | Total    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans held for investment, outstanding balance   $ 1,624,356
Consumer | Total | Performing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans held for investment, outstanding balance   1,614,158
Consumer | Total | Nonperforming    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans held for investment, outstanding balance   $ 10,198