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Loans and Allowance - Allowance for Credit Losses and Loan Portfolio by Loan 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]        
Allowance balances - Individually evaluated for impairment $ 1,872 $ 1,637    
Allowance balances - Collectively evaluated for impairment 78,680 73,395    
Total allowance for loan losses 80,552 75,032 $ 66,037 $ 62,453
Loan balances - Individually evaluated for impairment 22,025 23,211    
Loan balances - Collectively evaluated for impairment 7,186,658 6,703,034    
Loans 7,224,467 6,751,199    
Loans acquired with deteriorated credit quality        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans 15,784 24,954    
Commercial        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance balances - Individually evaluated for impairment 666    
Allowance balances - Collectively evaluated for impairment 32,655 29,752    
Total allowance for loan losses 32,655 30,418 27,696 26,478
Loan balances - Individually evaluated for impairment 1,838 3,345    
Loan balances - Collectively evaluated for impairment 2,246,730 2,005,275    
Loans 2,250,670 2,010,041    
Commercial | Loans acquired with deteriorated credit quality        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans 2,102 1,421    
Commercial Real Estate        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance balances - Individually evaluated for impairment 1,435 567    
Allowance balances - Collectively evaluated for impairment 28,174 26,776    
Total allowance for loan losses 29,609 27,343 23,661 22,145
Loan balances - Individually evaluated for impairment 17,756 17,432    
Loan balances - Collectively evaluated for impairment 3,347,686 3,135,481    
Loans 3,377,831 3,174,910    
Commercial Real Estate | Loans acquired with deteriorated credit quality        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans 12,389 21,997    
Consumer        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance balances - Individually evaluated for impairment 1    
Allowance balances - Collectively evaluated for impairment 3,963 3,732    
Total allowance for loan losses 3,964 3,732 2,923 2,689
Loan balances - Individually evaluated for impairment 18 5    
Loan balances - Collectively evaluated for impairment 99,770 86,930    
Loans 99,788 86,935    
Consumer | Loans acquired with deteriorated credit quality        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans    
Residential        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance balances - Individually evaluated for impairment 436 404    
Allowance balances - Collectively evaluated for impairment 13,886 13,133    
Total allowance for loan losses 14,322 13,537 11,755 11,139
Loan balances - Individually evaluated for impairment 2,413 2,429    
Loan balances - Collectively evaluated for impairment 1,490,872 1,472,821    
Loans 1,494,578 1,476,786    
Residential | Loans acquired with deteriorated credit quality        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans 1,293 1,536    
Finance Leases        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance balances - Individually evaluated for impairment    
Allowance balances - Collectively evaluated for impairment 2 2    
Total allowance for loan losses 2 2 $ 2 $ 2
Loan balances - Individually evaluated for impairment    
Loan balances - Collectively evaluated for impairment 1,600 2,527    
Loans 1,600 2,527    
Finance Leases | Loans acquired with deteriorated credit quality        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans