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Loans and Allowance for Credit Losses - Recorded investments in loans related to each balance in the allowance for loan losses by portfolio segment (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Recorded investment in loans:      
Financing Receivable, Individually Evaluated for Impairment     $ 68,206
Financing Receivable, Collectively Evaluated for Impairment     7,477,542
Net loans $ 7,760,212   7,545,748
Commercial      
Recorded investment in loans:      
Financing Receivable, Individually Evaluated for Impairment     25,288
Financing Receivable, Collectively Evaluated for Impairment     1,520,618
Net loans 1,437,433 $ 1,545,906 1,545,906
Income producing - commercial real estate      
Recorded investment in loans:      
Financing Receivable, Individually Evaluated for Impairment     19,093
Financing Receivable, Collectively Evaluated for Impairment     3,683,654
Net loans 3,687,000 3,702,747 3,702,747
Owner occupied - commercial real estate      
Recorded investment in loans:      
Financing Receivable, Individually Evaluated for Impairment     6,463
Financing Receivable, Collectively Evaluated for Impairment     978,946
Net loans 997,694 985,409 985,409
Real estate mortgage - residential      
Recorded investment in loans:      
Financing Receivable, Individually Evaluated for Impairment     5,365
Financing Receivable, Collectively Evaluated for Impairment     98,856
Net loans 76,592 104,221 104,221
Construction - commercial and residential      
Recorded investment in loans:      
Financing Receivable, Individually Evaluated for Impairment     11,510
Financing Receivable, Collectively Evaluated for Impairment     1,113,734
Net loans 873,261 1,035,754 1,125,244
Home equity      
Recorded investment in loans:      
Financing Receivable, Individually Evaluated for Impairment     487
Financing Receivable, Collectively Evaluated for Impairment     79,574
Net loans 73,167 80,061 80,061
Other consumer      
Recorded investment in loans:      
Financing Receivable, Individually Evaluated for Impairment     0
Financing Receivable, Collectively Evaluated for Impairment     2,160
Net loans $ 1,389 $ 2,160 $ 2,160