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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
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loans, Individually Evaluated for Impairment $ 78,313   $ 64,321    
Loans, Collectively Evaluated for Impairment 13,611,532   12,608,826    
Loans 13,965,017   12,840,330    
Allowance for Credit Losses Individually Evaluated for Impairment 2,807   3,992    
Allowance for Credit Losses Collectively Evaluated for Impairment 173,671   102,033    
Total Allowance for Credit Losses 226,701 $ 76,000 109,222 $ 104,779 $ 103,419
PCD          
Financing Receivable, Allowance for Credit Loss [Line Items]          
PCD 275,172   167,183    
Total Allowance for Credit Losses 50,223 $ 35,700 3,197    
Commercial Industrial And Agricultural          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loans, Individually Evaluated for Impairment 28,682   34,142    
Loans, Collectively Evaluated for Impairment 5,299,373   4,807,114    
Loans 5,444,292   4,887,141    
Allowance for Credit Losses Individually Evaluated for Impairment 1,821   3,414    
Allowance for Credit Losses Collectively Evaluated for Impairment 91,604   59,108    
Total Allowance for Credit Losses 113,733   62,830 64,685 63,276
Commercial Industrial And Agricultural | PCD          
Financing Receivable, Allowance for Credit Loss [Line Items]          
PCD 116,237   45,885    
Total Allowance for Credit Losses 20,308   308    
Commercial real estate          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loans, Individually Evaluated for Impairment 49,631   30,179    
Loans, Collectively Evaluated for Impairment 4,913,948   4,552,796    
Loans 5,097,850   4,682,072    
Allowance for Credit Losses Individually Evaluated for Impairment 986   578    
Allowance for Credit Losses Collectively Evaluated for Impairment 28,999   16,301    
Total Allowance for Credit Losses 59,396   18,635    
Commercial real estate | PCD          
Financing Receivable, Allowance for Credit Loss [Line Items]          
PCD 134,271   99,097    
Total Allowance for Credit Losses 29,411   1,756    
Total corporate loans          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loans, Individually Evaluated for Impairment 78,313   64,321    
Loans, Collectively Evaluated for Impairment 10,213,321   9,359,910    
Loans 10,542,142   9,569,213    
Allowance for Credit Losses Individually Evaluated for Impairment 2,807   3,992    
Allowance for Credit Losses Collectively Evaluated for Impairment 120,603   75,409    
Total Allowance for Credit Losses 173,129   81,465    
Total corporate loans | PCD          
Financing Receivable, Allowance for Credit Loss [Line Items]          
PCD 250,508   144,982    
Total Allowance for Credit Losses 49,719   2,064    
Consumer loans          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loans, Individually Evaluated for Impairment 0   0    
Loans, Collectively Evaluated for Impairment 3,398,211   3,248,916    
Loans 3,422,875   3,271,117    
Allowance for Credit Losses Individually Evaluated for Impairment 0   0    
Allowance for Credit Losses Collectively Evaluated for Impairment 46,315   25,424    
Total Allowance for Credit Losses 46,819   26,557    
Consumer loans | PCD          
Financing Receivable, Allowance for Credit Loss [Line Items]          
PCD 24,664   22,201    
Total Allowance for Credit Losses 504   1,133    
Office, retail, and industrial | Commercial real estate          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loans, Individually Evaluated for Impairment 25,092   24,820    
Loans, Collectively Evaluated for Impairment 2,192,942   1,795,557    
Loans 2,279,068   1,848,718    
Allowance for Credit Losses Individually Evaluated for Impairment 986   578    
Allowance for Credit Losses Collectively Evaluated for Impairment 13,257   6,899    
Total Allowance for Credit Losses 25,856   7,580 7,679 7,900
Office, retail, and industrial | Commercial real estate | PCD          
Financing Receivable, Allowance for Credit Loss [Line Items]          
PCD 61,034   28,341    
Total Allowance for Credit Losses 11,613   103    
Multi-family | Commercial real estate          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loans, Individually Evaluated for Impairment 2,338   1,995    
Loans, Collectively Evaluated for Impairment 900,583   851,857    
Loans 906,281   856,553    
Allowance for Credit Losses Individually Evaluated for Impairment 0   0    
Allowance for Credit Losses Collectively Evaluated for Impairment 3,642   2,854    
Total Allowance for Credit Losses 3,689   2,950 2,216 2,464
Multi-family | Commercial real estate | PCD          
Financing Receivable, Allowance for Credit Loss [Line Items]          
PCD 3,360   2,701    
Total Allowance for Credit Losses 47   96    
Construction | Commercial real estate          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loans, Individually Evaluated for Impairment 18,734   123    
Loans, Collectively Evaluated for Impairment 522,832   581,747    
Loans 562,689   593,093    
Allowance for Credit Losses Individually Evaluated for Impairment 0   0    
Allowance for Credit Losses Collectively Evaluated for Impairment 3,678   1,681    
Total Allowance for Credit Losses 11,297   1,697 2,131 2,173
Construction | Commercial real estate | PCD          
Financing Receivable, Allowance for Credit Loss [Line Items]          
PCD 21,123   11,223    
Total Allowance for Credit Losses 7,619   16    
Other commercial real estate | Commercial real estate          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loans, Individually Evaluated for Impairment 3,467   3,241    
Loans, Collectively Evaluated for Impairment 1,297,591   1,323,635    
Loans 1,349,812   1,383,708    
Allowance for Credit Losses Individually Evaluated for Impairment 0   0    
Allowance for Credit Losses Collectively Evaluated for Impairment 8,422   4,867    
Total Allowance for Credit Losses 18,554   6,408 4,930 4,934
Other commercial real estate | Commercial real estate | PCD          
Financing Receivable, Allowance for Credit Loss [Line Items]          
PCD 48,754   56,832    
Total Allowance for Credit Losses 10,132   1,541    
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    
Loans 0   0    
Allowance for Credit Losses Individually Evaluated for Impairment 0   0    
Allowance for Credit Losses Collectively Evaluated for Impairment 6,753   1,200    
Total Allowance for Credit Losses 6,753   1,200 $ 1,200 $ 1,200
Allowance for unfunded commitments | PCD          
Financing Receivable, Allowance for Credit Loss [Line Items]          
PCD 0   0    
Total Allowance for Credit Losses $ 0   $ 0