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Past Due Loans, Allowance For Credit Losses, Impaired Loans, and TDRs (Details) - Loans and Related Allowance for Credit Losses by Portfolio Segment - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment $ 42,650 $ 13,676    
Loans Collectively Evaluated for Impairment 8,149,828 7,087,834    
Loans 8,254,145 7,161,715    
Allowance for Credit Losses Individually Evaluated for Impairment 525 1,598    
Allowance for Credit Losses Collectively Evaluated for Impairment 81,864 68,003    
Total Allowance for Credit Losses 87,083 74,855 $ 74,510 $ 87,121
Receivables acquired with deteriorated credit quality        
Financing Receivable, Allowance for Credit Losses [Line Items]        
PCI 61,667 60,205    
Total Allowance for Credit Losses 4,694 5,254    
Covered loans        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 0 0    
Loans Collectively Evaluated for Impairment 15,379 20,856    
Loans 23,274 30,775    
Allowance for Credit Losses Individually Evaluated for Impairment 0 0    
Allowance for Credit Losses Collectively Evaluated for Impairment 109 248    
Total Allowance for Credit Losses 918 1,638 7,226 12,559
Covered loans | Receivables acquired with deteriorated credit quality        
Financing Receivable, Allowance for Credit Losses [Line Items]        
PCI 7,895 9,919    
Total Allowance for Credit Losses 809 1,390    
Reserve for unfunded commitments        
Financing Receivable, Allowance for Credit Losses [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 1,000 1,225    
Total Allowance for Credit Losses 1,000 1,225 1,816 1,616
Reserve for unfunded commitments | Receivables acquired with deteriorated credit quality        
Financing Receivable, Allowance for Credit Losses [Line Items]        
PCI 0 0    
Total Allowance for Credit Losses 0 0    
Commercial, industrial, and agricultural        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 24,645 2,871    
Loans Collectively Evaluated for Impairment 3,189,327 2,902,361    
Loans 3,217,154 2,912,166    
Allowance for Credit Losses Individually Evaluated for Impairment 507 883    
Allowance for Credit Losses Collectively Evaluated for Impairment 39,554 35,378    
Total Allowance for Credit Losses 40,709 37,074 29,458 30,381
Commercial, industrial, and agricultural | Receivables acquired with deteriorated credit quality        
Financing Receivable, Allowance for Credit Losses [Line Items]        
PCI 3,182 6,934    
Total Allowance for Credit Losses 648 813    
Commercial real estate loans        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 18,005 10,805    
Loans Collectively Evaluated for Impairment 3,567,621 3,028,658    
Loans 3,626,760 3,071,850    
Allowance for Credit Losses Individually Evaluated for Impairment 18 715    
Allowance for Credit Losses Collectively Evaluated for Impairment 29,100 19,727    
Total Allowance for Credit Losses 31,962 23,106    
Commercial real estate loans | Receivables acquired with deteriorated credit quality        
Financing Receivable, Allowance for Credit Losses [Line Items]        
PCI 41,134 32,387    
Total Allowance for Credit Losses 2,844 2,664    
Commercial real estate loans | Office, retail, and industrial        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 16,287 6,162    
Loans Collectively Evaluated for Impairment 1,553,234 1,376,789    
Loans 1,581,827 1,395,454    
Allowance for Credit Losses Individually Evaluated for Impairment 0 715    
Allowance for Credit Losses Collectively Evaluated for Impairment 16,148 10,833    
Total Allowance for Credit Losses 17,534 13,116 10,992 10,405
Commercial real estate loans | Office, retail, and industrial | Receivables acquired with deteriorated credit quality        
Financing Receivable, Allowance for Credit Losses [Line Items]        
PCI 12,306 12,503    
Total Allowance for Credit Losses 1,386 1,568    
Commercial real estate loans | Multi-family        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 398 800    
Loans Collectively Evaluated for Impairment 601,429 526,037    
Loans 614,034 528,324    
Allowance for Credit Losses Individually Evaluated for Impairment 0 0    
Allowance for Credit Losses Collectively Evaluated for Impairment 3,059 2,367    
Total Allowance for Credit Losses 3,254 2,462 2,249 2,017
Commercial real estate loans | Multi-family | Receivables acquired with deteriorated credit quality        
Financing Receivable, Allowance for Credit Losses [Line Items]        
PCI 12,207 1,487    
Total Allowance for Credit Losses 195 95    
Commercial real estate loans | Construction        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 34 178    
Loans Collectively Evaluated for Impairment 447,058 212,671    
Loans 451,540 216,882    
Allowance for Credit Losses Individually Evaluated for Impairment 0 0    
Allowance for Credit Losses Collectively Evaluated for Impairment 3,280 1,160    
Total Allowance for Credit Losses 3,444 1,440 2,297 6,316
Commercial real estate loans | Construction | Receivables acquired with deteriorated credit quality        
Financing Receivable, Allowance for Credit Losses [Line Items]        
PCI 4,448 4,033    
Total Allowance for Credit Losses 164 280    
Commercial real estate loans | Other commercial real estate        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 1,286 3,665    
Loans Collectively Evaluated for Impairment 965,900 913,161    
Loans 979,359 931,190    
Allowance for Credit Losses Individually Evaluated for Impairment 18 0    
Allowance for Credit Losses Collectively Evaluated for Impairment 6,613 5,367    
Total Allowance for Credit Losses 7,730 6,088 $ 8,327 $ 10,817
Commercial real estate loans | Other commercial real estate | Receivables acquired with deteriorated credit quality        
Financing Receivable, Allowance for Credit Losses [Line Items]        
PCI 12,173 14,364    
Total Allowance for Credit Losses 1,099 721    
Total corporate loans        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 42,650 13,676    
Loans Collectively Evaluated for Impairment 6,756,948 5,931,019    
Loans 6,843,914 5,984,016    
Allowance for Credit Losses Individually Evaluated for Impairment 525 1,598    
Allowance for Credit Losses Collectively Evaluated for Impairment 68,654 55,105    
Total Allowance for Credit Losses 72,671 60,180    
Total corporate loans | Receivables acquired with deteriorated credit quality        
Financing Receivable, Allowance for Credit Losses [Line Items]        
PCI 44,316 39,321    
Total Allowance for Credit Losses 3,492 3,477    
Consumer loans        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 0 0    
Loans Collectively Evaluated for Impairment 1,377,501 1,135,959    
Loans 1,386,957 1,146,924    
Allowance for Credit Losses Individually Evaluated for Impairment 0 0    
Allowance for Credit Losses Collectively Evaluated for Impairment 12,101 11,425    
Total Allowance for Credit Losses 12,494 11,812    
Consumer loans | Receivables acquired with deteriorated credit quality        
Financing Receivable, Allowance for Credit Losses [Line Items]        
PCI 9,456 10,965    
Total Allowance for Credit Losses $ 393 $ 387