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Loans and Allowance for Credit Losses - Class of loan, an aging analysis and the recorded investments in loans past due (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]    
Non-Accrual $ 31,247 $ 60,943
Loans 6,850,863 7,760,212
Construction - C&I (owner occupied)    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 222,366  
Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Non-Accrual 12,147 15,352
Loans 1,289,215 1,437,433
PPP loans    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 67,311 454,771
Income producing - commercial real estate    
Loans and Leases Receivable Disclosure [Line Items]    
Non-Accrual 14,933 18,880
Loans 3,337,303 3,687,000
Owner occupied - commercial real estate    
Loans and Leases Receivable Disclosure [Line Items]    
Non-Accrual 1,593 23,158
Loans 977,617 997,694
Real estate mortgage - residential    
Loans and Leases Receivable Disclosure [Line Items]    
Non-Accrual 2,018 2,931
Loans 76,259 76,592
Construction - commercial and residential    
Loans and Leases Receivable Disclosure [Line Items]    
Non-Accrual 0 206
Loans 824,133 873,261
Construction - commercial and residential | Construction - C&I (owner occupied)    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 222,366 158,905
Construction and Industrial, Owner Occupied | Construction - C&I (owner occupied)    
Loans and Leases Receivable Disclosure [Line Items]    
Loans   158,905
Home equity    
Loans and Leases Receivable Disclosure [Line Items]    
Non-Accrual 556 416
Loans 55,527 73,167
Other consumer    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 1,132 1,389
Current    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 6,807,516 7,595,544
Current | Construction - C&I (owner occupied)    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 221,463  
Current | Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 1,276,100 1,394,244
Current | PPP loans    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 64,004 454,771
Current | Income producing - commercial real estate    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 3,322,370 3,616,207
Current | Owner occupied - commercial real estate    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 972,632 960,364
Current | Real estate mortgage - residential    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 74,241 72,231
Current | Construction - commercial and residential    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 821,051 869,723
Current | Construction and Industrial, Owner Occupied | Construction - C&I (owner occupied)    
Loans and Leases Receivable Disclosure [Line Items]    
Loans   158,905
Current | Home equity    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 54,575 67,732
Current | Other consumer    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 1,080 1,367
Past Due    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 12,100 103,725
Past Due | Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 968 27,837
Past Due | PPP loans    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 3,307  
Past Due | Income producing - commercial real estate    
Loans and Leases Receivable Disclosure [Line Items]    
Loans   51,913
Past Due | Owner occupied - commercial real estate    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 3,392 14,172
Past Due | Real estate mortgage - residential    
Loans and Leases Receivable Disclosure [Line Items]    
Loans   1,430
Past Due | Construction - commercial and residential    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 3,082 3,332
Past Due | Construction and Industrial, Owner Occupied    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 903  
Past Due | Home equity    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 396 5,019
Past Due | Other consumer    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 52 22
30 to 59 days past due    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 5,064 21,951
30 to 59 days past due | Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 96 6,411
30 to 59 days past due | PPP loans    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 3,307  
30 to 59 days past due | Owner occupied - commercial real estate    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 579 10,630
30 to 59 days past due | Real estate mortgage - residential    
Loans and Leases Receivable Disclosure [Line Items]    
Loans   1,430
30 to 59 days past due | Construction - commercial and residential    
Loans and Leases Receivable Disclosure [Line Items]    
Loans   2,992
30 to 59 days past due | Construction and Industrial, Owner Occupied    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 903  
30 to 59 days past due | Home equity    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 127 467
30 to 59 days past due | Other consumer    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 52 21
60-89 days past due    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 7,036 81,774
60-89 days past due | Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 872 21,426
60-89 days past due | Income producing - commercial real estate    
Loans and Leases Receivable Disclosure [Line Items]    
Loans   51,913
60-89 days past due | Owner occupied - commercial real estate    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 2,813 3,542
60-89 days past due | Construction - commercial and residential    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 3,082 340
60-89 days past due | Home equity    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 269 4,552
60-89 days past due | Other consumer    
Loans and Leases Receivable Disclosure [Line Items]    
Loans   1
90 Days or More Past Due    
Loans and Leases Receivable Disclosure [Line Items]    
Loans $ 0 $ 0