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Past Due Loans, Allowance For Credit Losses, Impaired Loans, and TDRs - Loans and Related Allowance for Credit Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment $ 42,509 $ 51,617    
Loans Collectively Evaluated for Impairment 11,290,406 10,248,742    
Total loans 11,446,783 10,437,812    
Allowance for Credit Losses Individually Evaluated for Impairment 4,709 10,074    
Allowance for Credit Losses Collectively Evaluated for Impairment 94,578 82,341    
Total Allowance for Credit Losses 103,419 96,729 $ 87,083 $ 74,855
PCI        
Financing Receivable, Allowance for Credit Losses [Line Items]        
PCI 113,868 137,453    
Total Allowance for Credit Losses 4,132 4,314    
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    
Total loans 0 0    
Allowance for Credit Losses Individually Evaluated for Impairment 0 0    
Allowance for Credit Losses Collectively Evaluated for Impairment 1,200 1,000    
Total Allowance for Credit Losses 1,200 1,000 1,000 1,225
Reserve for unfunded commitments | PCI        
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 32,415 38,718    
Loans Collectively Evaluated for Impairment 4,514,349 3,909,380    
Total loans 4,551,221 3,960,800    
Allowance for Credit Losses Individually Evaluated for Impairment 3,961 10,074    
Allowance for Credit Losses Collectively Evaluated for Impairment 58,947 45,293    
Total Allowance for Credit Losses 63,276 55,791 40,709 37,074
Commercial, industrial, and agricultural | PCI        
Financing Receivable, Allowance for Credit Losses [Line Items]        
PCI 4,457 12,702    
Total Allowance for Credit Losses 368 424    
Commercial real estate loans        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 10,094 12,899    
Loans Collectively Evaluated for Impairment 4,496,277 4,437,906    
Total loans 4,596,249 4,553,618    
Allowance for Credit Losses Individually Evaluated for Impairment 748 0    
Allowance for Credit Losses Collectively Evaluated for Impairment 14,337 20,515    
Total Allowance for Credit Losses 17,471 23,392    
Commercial real estate loans | PCI        
Financing Receivable, Allowance for Credit Losses [Line Items]        
PCI 89,878 102,813    
Total Allowance for Credit Losses 2,386 2,877    
Commercial real estate loans | Office, retail, and industrial        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 5,057 10,810    
Loans Collectively Evaluated for Impairment 1,799,304 1,954,435    
Total loans 1,820,917 1,979,820    
Allowance for Credit Losses Individually Evaluated for Impairment 748 0    
Allowance for Credit Losses Collectively Evaluated for Impairment 5,984 9,333    
Total Allowance for Credit Losses 7,900 10,996 17,595 13,124
Commercial real estate loans | Office, retail, and industrial | PCI        
Financing Receivable, Allowance for Credit Losses [Line Items]        
PCI 16,556 14,575    
Total Allowance for Credit Losses 1,168 1,663    
Commercial real estate loans | Multi-family        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 3,492 621    
Loans Collectively Evaluated for Impairment 747,030 660,771    
Total loans 764,185 675,463    
Allowance for Credit Losses Individually Evaluated for Impairment 0 0    
Allowance for Credit Losses Collectively Evaluated for Impairment 2,154 2,436    
Total Allowance for Credit Losses 2,464 2,534 3,261 2,469
Commercial real estate loans | Multi-family | PCI        
Financing Receivable, Allowance for Credit Losses [Line Items]        
PCI 13,663 14,071    
Total Allowance for Credit Losses 310 98    
Commercial real estate loans | Construction        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 0 0    
Loans Collectively Evaluated for Impairment 644,499 530,977    
Total loans 649,337 539,820    
Allowance for Credit Losses Individually Evaluated for Impairment 0 0    
Allowance for Credit Losses Collectively Evaluated for Impairment 2,019 3,331    
Total Allowance for Credit Losses 2,173 3,481 3,444 1,440
Commercial real estate loans | Construction | PCI        
Financing Receivable, Allowance for Credit Losses [Line Items]        
PCI 4,838 8,843    
Total Allowance for Credit Losses 154 150    
Commercial real estate loans | Other commercial real estate        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 1,545 1,468    
Loans Collectively Evaluated for Impairment 1,305,444 1,291,723    
Total loans 1,361,810 1,358,515    
Allowance for Credit Losses Individually Evaluated for Impairment 0 0    
Allowance for Credit Losses Collectively Evaluated for Impairment 4,180 5,415    
Total Allowance for Credit Losses 4,934 6,381 $ 7,739 $ 6,109
Commercial real estate loans | Other commercial real estate | PCI        
Financing Receivable, Allowance for Credit Losses [Line Items]        
PCI 54,821 65,324    
Total Allowance for Credit Losses 754 966    
Total corporate loans        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 42,509 51,617    
Loans Collectively Evaluated for Impairment 9,010,626 8,347,286    
Total loans 9,147,470 8,514,418    
Allowance for Credit Losses Individually Evaluated for Impairment 4,709 10,074    
Allowance for Credit Losses Collectively Evaluated for Impairment 73,284 65,808    
Total Allowance for Credit Losses 80,747 79,183    
Total corporate loans | PCI        
Financing Receivable, Allowance for Credit Losses [Line Items]        
PCI 94,335 115,515    
Total Allowance for Credit Losses 2,754 3,301    
Consumer loans        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 0 0    
Loans Collectively Evaluated for Impairment 2,279,780 1,901,456    
Total loans 2,299,313 1,923,394    
Allowance for Credit Losses Individually Evaluated for Impairment 0 0    
Allowance for Credit Losses Collectively Evaluated for Impairment 20,094 15,533    
Total Allowance for Credit Losses 21,472 16,546    
Consumer loans | PCI        
Financing Receivable, Allowance for Credit Losses [Line Items]        
PCI 19,533 21,938    
Total Allowance for Credit Losses $ 1,378 $ 1,013