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Loans and Allowance for Credit Losses for Loans - Impaired Loans (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Financing Receivable, Impaired [Line Items]  
Recorded Investment With No Related Allowance $ 47,219
Recorded Investment With Related Allowance 116,425
Total Recorded Investment 163,644
Unpaid Contractual Principal Balance 179,243
Related Allowance 38,576
Commercial and industrial  
Financing Receivable, Impaired [Line Items]  
Recorded Investment With No Related Allowance 14,617
Recorded Investment With Related Allowance 86,243
Total Recorded Investment 100,860
Unpaid Contractual Principal Balance 114,875
Related Allowance 36,662
Commercial real estate  
Financing Receivable, Impaired [Line Items]  
Recorded Investment With No Related Allowance 26,400
Recorded Investment With Related Allowance 24,842
Total Recorded Investment 51,242
Unpaid Contractual Principal Balance 51,612
Related Allowance 1,338
Commercial real estate | Commercial real estate  
Financing Receivable, Impaired [Line Items]  
Recorded Investment With No Related Allowance 26,046
Recorded Investment With Related Allowance 24,842
Total Recorded Investment 50,888
Unpaid Contractual Principal Balance 51,258
Related Allowance 1,338
Commercial real estate | Construction  
Financing Receivable, Impaired [Line Items]  
Recorded Investment With No Related Allowance 354
Recorded Investment With Related Allowance 0
Total Recorded Investment 354
Unpaid Contractual Principal Balance 354
Related Allowance 0
Residential mortgage  
Financing Receivable, Impaired [Line Items]  
Recorded Investment With No Related Allowance 5,836
Recorded Investment With Related Allowance 4,853
Total Recorded Investment 10,689
Unpaid Contractual Principal Balance 11,800
Related Allowance 518
Consumer loans  
Financing Receivable, Impaired [Line Items]  
Recorded Investment With No Related Allowance 366
Recorded Investment With Related Allowance 487
Total Recorded Investment 853
Unpaid Contractual Principal Balance 956
Related Allowance 58
Consumer loans | Home equity  
Financing Receivable, Impaired [Line Items]  
Recorded Investment With No Related Allowance 366
Recorded Investment With Related Allowance 487
Total Recorded Investment 853
Unpaid Contractual Principal Balance 956
Related Allowance $ 58