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Past Due Loans, Allowance For Credit Losses, Non-Accrual Loans, and TDRS - Loans and Related Allowance for Credit Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]            
Loans, Individually Evaluated for Impairment $ 42,396   $ 88,203      
Loans, Collectively Evaluated for Impairment 14,585,182   14,451,008      
Total 14,788,732   14,751,232      
Allowance for Credit Losses Individually Evaluated for Impairment 2,047   4,830      
Allowance for Credit Losses Collectively Evaluated for Impairment 193,856   211,085      
Allowance for Credit Losses, PCD and Total 214,866 $ 223,226 247,042 $ 246,873 $ 247,677 $ 109,222
PCD            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Total 161,154   212,021      
Allowance for Credit Losses, PCD and Total 18,963   31,127      
Commercial, industrial, agricultural            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Loans, Individually Evaluated for Impairment 14,580   45,650      
Loans, Collectively Evaluated for Impairment 4,993,501   4,826,017      
Total 5,054,617   4,942,292      
Allowance for Credit Losses Individually Evaluated for Impairment 1,499   3,536      
Allowance for Credit Losses Collectively Evaluated for Impairment 105,470   107,763      
Allowance for Credit Losses, PCD and Total 111,939 116,396 119,954 125,728 123,977 62,830
Commercial, industrial, agricultural | PCD            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Total 46,536   70,625      
Allowance for Credit Losses, PCD and Total 4,970   8,655      
Commercial real estate            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Loans, Individually Evaluated for Impairment 27,816   42,553      
Loans, Collectively Evaluated for Impairment 4,729,614   4,667,386      
Total 4,852,692   4,829,168      
Allowance for Credit Losses Individually Evaluated for Impairment 548   1,294      
Allowance for Credit Losses Collectively Evaluated for Impairment 30,946   37,730      
Allowance for Credit Losses, PCD and Total 44,988   60,770      
Commercial real estate | PCD            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Total 95,262   119,229      
Allowance for Credit Losses, PCD and Total 13,494   21,746      
Total corporate loans, excluding Paycheck Protection Program ("PPP") loans            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Loans, Individually Evaluated for Impairment 42,396   88,203      
Loans, Collectively Evaluated for Impairment 9,723,115   9,493,403      
Total 9,907,309   9,771,460      
Allowance for Credit Losses Individually Evaluated for Impairment 2,047   4,830      
Allowance for Credit Losses Collectively Evaluated for Impairment 136,416   145,493      
Allowance for Credit Losses, PCD and Total 156,927   180,724      
Total corporate loans, excluding Paycheck Protection Program ("PPP") loans | PCD            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Total 141,798   189,854      
Allowance for Credit Losses, PCD and Total 18,464   30,401      
PPP loans            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Loans, Individually Evaluated for Impairment 0   0      
Loans, Collectively Evaluated for Impairment 384,100   785,563      
Total 384,100   785,563      
Allowance for Credit Losses Individually Evaluated for Impairment 0   0      
Allowance for Credit Losses Collectively Evaluated for Impairment 0   0      
Allowance for Credit Losses, PCD and Total 0   0      
PPP loans | PCD            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Total 0   0      
Allowance for Credit Losses, PCD and Total 0   0      
Total corporate loans            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Loans, Individually Evaluated for Impairment 42,396   88,203      
Loans, Collectively Evaluated for Impairment 10,107,215   10,278,966      
Total 10,291,409   10,557,023      
Allowance for Credit Losses Individually Evaluated for Impairment 2,047   4,830      
Allowance for Credit Losses Collectively Evaluated for Impairment 136,416   145,493      
Allowance for Credit Losses, PCD and Total 156,927   180,724      
Total corporate loans | PCD            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Total 141,798   189,854      
Allowance for Credit Losses, PCD and Total 18,464   30,401      
Consumer            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Loans, Individually Evaluated for Impairment 0   0      
Loans, Collectively Evaluated for Impairment 4,477,967   4,172,042      
Total 4,497,323   4,194,209      
Allowance for Credit Losses Individually Evaluated for Impairment 0   0      
Allowance for Credit Losses Collectively Evaluated for Impairment 48,815   57,567      
Allowance for Credit Losses, PCD and Total 49,314   58,293      
Consumer | PCD            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Total 19,356   22,167      
Allowance for Credit Losses, PCD and Total 499   726      
Office, retail, and industrial | Commercial real estate            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Loans, Individually Evaluated for Impairment 12,498   26,384      
Loans, Collectively Evaluated for Impairment 1,719,005   1,792,618      
Total 1,765,592   1,861,768      
Allowance for Credit Losses Individually Evaluated for Impairment 384   1,123      
Allowance for Credit Losses Collectively Evaluated for Impairment 13,902   15,106      
Allowance for Credit Losses, PCD and Total 17,708 17,992 24,078 24,738 24,441 7,580
Office, retail, and industrial | Commercial real estate | PCD            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Total 34,089   42,766      
Allowance for Credit Losses, PCD and Total 3,422   7,849      
Multi- family | Commercial real estate            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Loans, Individually Evaluated for Impairment 2,171   1,279      
Loans, Collectively Evaluated for Impairment 1,074,323   864,677      
Total 1,082,941   872,813      
Allowance for Credit Losses Individually Evaluated for Impairment 0   0      
Allowance for Credit Losses Collectively Evaluated for Impairment 3,555   5,438      
Allowance for Credit Losses, PCD and Total 3,630 3,459 5,709 5,739 5,311 2,950
Multi- family | Commercial real estate | PCD            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Total 6,447   6,857      
Allowance for Credit Losses, PCD and Total 75   271      
Construction | Commercial real estate            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Loans, Individually Evaluated for Impairment 1,154   1,154      
Loans, Collectively Evaluated for Impairment 582,683   595,550      
Total 595,204   612,611      
Allowance for Credit Losses Individually Evaluated for Impairment 0   0      
Allowance for Credit Losses Collectively Evaluated for Impairment 3,406   4,535      
Allowance for Credit Losses, PCD and Total 3,728 4,924 6,674 6,732 11,522 1,697
Construction | Commercial real estate | PCD            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Total 11,367   15,907      
Allowance for Credit Losses, PCD and Total 322   2,139      
Other commercial real estate | Commercial real estate            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Loans, Individually Evaluated for Impairment 11,993   13,736      
Loans, Collectively Evaluated for Impairment 1,353,603   1,414,541      
Total 1,408,955   1,481,976      
Allowance for Credit Losses Individually Evaluated for Impairment 164   171      
Allowance for Credit Losses Collectively Evaluated for Impairment 10,083   12,651      
Allowance for Credit Losses, PCD and Total 19,922 20,058 24,309 23,631 21,862 6,408
Other commercial real estate | Commercial real estate | PCD            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Total 43,359   53,699      
Allowance for Credit Losses, PCD and Total 9,675   11,487      
Allowance for unfunded commitments            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Loans, Individually Evaluated for Impairment 0   0      
Loans, Collectively Evaluated for Impairment 0   0      
Total 0   0      
Allowance for Credit Losses Individually Evaluated for Impairment 0   0      
Allowance for Credit Losses Collectively Evaluated for Impairment 8,625   8,025      
Allowance for Credit Losses, PCD and Total 8,625 $ 8,625 8,025 $ 7,825 $ 7,625 $ 1,200
Allowance for unfunded commitments | PCD            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Total 0   0      
Allowance for Credit Losses, PCD and Total $ 0   $ 0