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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
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2020
Loans and Leases Receivable Disclosure [Line Items]      
Nonaccrual Loans $ 29,208 $ 60,943  
Loans 7,065,598 7,760,212  
Commercial      
Loans and Leases Receivable Disclosure [Line Items]      
Nonaccrual Loans 8,876 15,352  
Loans 1,354,317 1,437,433 $ 1,545,906
PPP loans      
Loans and Leases Receivable Disclosure [Line Items]      
Nonaccrual Loans 1,365    
Loans 51,105 454,771  
Income producing - commercial real estate      
Loans and Leases Receivable Disclosure [Line Items]      
Nonaccrual Loans 13,456 18,880  
Loans 3,385,298 3,687,000 3,702,747
Owner occupied - commercial real estate      
Loans and Leases Receivable Disclosure [Line Items]      
Nonaccrual Loans 42 23,158  
Loans 1,087,776 997,694 985,409
Real estate mortgage - residential      
Loans and Leases Receivable Disclosure [Line Items]      
Nonaccrual Loans 2,010 2,931  
Loans 73,966 76,592 104,221
Construction - commercial and residential      
Loans and Leases Receivable Disclosure [Line Items]      
Nonaccrual Loans 3,093 206  
Loans 896,319 873,261 1,035,754
Construction - C&I (owner occupied)      
Loans and Leases Receivable Disclosure [Line Items]      
Nonaccrual Loans   0  
Loans 159,579 158,905 89,490
Home equity      
Loans and Leases Receivable Disclosure [Line Items]      
Nonaccrual Loans 366 416  
Loans 55,811 73,167 80,061
Other consumer      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 1,427 1,389 $ 2,160
Total Past Due Loans      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 25,843 103,725  
Total Past Due Loans | Commercial      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 2,134 27,837  
Total Past Due Loans | PPP loans      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 2,590    
Total Past Due Loans | Income producing - commercial real estate      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 0 51,913  
Total Past Due Loans | Owner occupied - commercial real estate      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 19,527 14,172  
Total Past Due Loans | Real estate mortgage - residential      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 1,372 1,430  
Total Past Due Loans | Construction - commercial and residential      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 0 3,332  
Total Past Due Loans | Construction - C&I (owner occupied)      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 0    
Total Past Due Loans | Home equity      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 220 5,019  
Total Past Due Loans | Other consumer      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 0 22  
30 to 59 days past due      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 5,051 21,951  
30 to 59 days past due | Commercial      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 1,462 6,411  
30 to 59 days past due | PPP loans      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 1,765    
30 to 59 days past due | Income producing - commercial real estate      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 0 0  
30 to 59 days past due | Owner occupied - commercial real estate      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 419 10,630  
30 to 59 days past due | Real estate mortgage - residential      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 1,372 1,430  
30 to 59 days past due | Construction - commercial and residential      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 0 2,992  
30 to 59 days past due | Construction - C&I (owner occupied)      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 0 0  
30 to 59 days past due | Home equity      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 33 467  
30 to 59 days past due | Other consumer      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 0 21  
60-89 days past due      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 20,792 81,774  
60-89 days past due | Commercial      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 672 21,426  
60-89 days past due | PPP loans      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 825    
60-89 days past due | Income producing - commercial real estate      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 0 51,913  
60-89 days past due | Owner occupied - commercial real estate      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 19,108 3,542  
60-89 days past due | Real estate mortgage - residential      
Loans and Leases Receivable Disclosure [Line Items]      
Loans   0  
60-89 days past due | Construction - commercial and residential      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 0 340  
60-89 days past due | Construction - C&I (owner occupied)      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 0 0  
60-89 days past due | Home equity      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 187 4,552  
60-89 days past due | Other consumer      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 0 1  
90 days or more past due      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 0 0  
90 days or more past due | Commercial      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 0 0  
90 days or more past due | Owner occupied - commercial real estate      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 0 0  
90 days or more past due | Construction - commercial and residential      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 0 0  
90 days or more past due | Construction - C&I (owner occupied)      
Loans and Leases Receivable Disclosure [Line Items]      
Loans   0  
90 days or more past due | Home equity      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 0 0  
Current Loans      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 7,010,547 7,595,544  
Current Loans | Commercial      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 1,343,307 1,394,244  
Current Loans | PPP loans      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 47,150 454,771  
Current Loans | Income producing - commercial real estate      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 3,371,842 3,616,207  
Current Loans | Owner occupied - commercial real estate      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 1,068,207 960,364  
Current Loans | Real estate mortgage - residential      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 70,584 72,231  
Current Loans | Construction - commercial and residential      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 893,226 869,723  
Current Loans | Construction - C&I (owner occupied)      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 159,579 158,905  
Current Loans | Home equity      
Loans and Leases Receivable Disclosure [Line Items]      
Loans 55,225 67,732  
Current Loans | Other consumer      
Loans and Leases Receivable Disclosure [Line Items]      
Loans $ 1,427 $ 1,367