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Loans and Leases and Allowance for Credit Losses - Recorded investment in loans by portfolio segment and the balance of the allowance for loan losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loans Outstanding, Individually evaluated for impairment   $ 61,971    
Loans Outstanding, Collectively evaluated for impairment   8,691,936    
PCI Loans   58,646    
Loans Outstanding, Ending Balance   8,812,553    
Allowance for credit losses, Individually evaluated for impairment   2,512    
Allowance for credit losses, Collectively evaluated for impairment   59,214    
Allowance for credit losses, PCI   363    
Allowance for credit losses, Ending balance $ 81,905 62,089 $ 61,642 $ 61,203
Allowance for unfunded commitments, Individually evaluated for impairment   0    
Allowance for unfunded commitments, Collectively evaluated for impairment   3,458    
Allowance for unfunded commitments, Ending Balance 6,470 3,458 3,141 3,410
Total allowance for credit losses, Individually evaluated for impairment   2,512    
Total allowance for credit losses, Collectively evaluated for impairment   62,672    
Total allowance for credit losses, PCI   363    
Total allowance for credit losses, Ending Balance 88,375 65,547 64,783 64,613
Loans receivable        
Financing Receivable, Allowance for Credit Loss [Line Items]        
PCI Loans   58,646    
Loans receivable | Commercial        
Financing Receivable, Allowance for Credit Loss [Line Items]        
PCI Loans   46,947    
Loans receivable | Commercial | Owner occupied commercial real estate        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loans Outstanding, Individually evaluated for impairment   19,233    
Loans Outstanding, Collectively evaluated for impairment   1,692,448    
PCI Loans   8,546    
Loans Outstanding, Ending Balance   1,720,227    
Allowance for credit losses, Individually evaluated for impairment   816    
Allowance for credit losses, Collectively evaluated for impairment   10,483    
Allowance for credit losses, PCI   105    
Allowance for credit losses, Ending balance 11,000 11,404 11,874 12,207
Loans receivable | Commercial | Income producing commercial real estate        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loans Outstanding, Individually evaluated for impairment   18,134    
Loans Outstanding, Collectively evaluated for impairment   1,962,588    
PCI Loans   27,228    
Loans Outstanding, Ending Balance   2,007,950    
Allowance for credit losses, Individually evaluated for impairment   770    
Allowance for credit losses, Collectively evaluated for impairment   11,507    
Allowance for credit losses, PCI   29    
Allowance for credit losses, Ending balance 16,584 12,306 11,126 11,073
Loans receivable | Commercial | Commercial & industrial        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loans Outstanding, Individually evaluated for impairment   1,449    
Loans Outstanding, Collectively evaluated for impairment   1,218,882    
PCI Loans   326    
Loans Outstanding, Ending Balance   1,220,657    
Allowance for credit losses, Individually evaluated for impairment   21    
Allowance for credit losses, Collectively evaluated for impairment   5,193    
Allowance for credit losses, PCI   52    
Allowance for credit losses, Ending balance 10,831 5,266 4,895 4,802
Loans receivable | Commercial | Construction        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loans Outstanding, Individually evaluated for impairment   3,675    
Loans Outstanding, Collectively evaluated for impairment   965,678    
PCI Loans   6,862    
Loans Outstanding, Ending Balance   976,215    
Allowance for credit losses, Individually evaluated for impairment   55    
Allowance for credit losses, Collectively evaluated for impairment   9,613    
Allowance for credit losses, PCI   0    
Allowance for credit losses, Ending balance 9,556 9,668 10,275 10,337
Loans receivable | Commercial | Equipment financing        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loans Outstanding, Individually evaluated for impairment   1,027    
Loans Outstanding, Collectively evaluated for impairment   739,532    
PCI Loans   3,985    
Loans Outstanding, Ending Balance   744,544    
Allowance for credit losses, Individually evaluated for impairment   0    
Allowance for credit losses, Collectively evaluated for impairment   7,240    
Allowance for credit losses, PCI   144    
Allowance for credit losses, Ending balance 14,738 7,384 6,231 5,452
Loans receivable | Residential | Construction        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loans Outstanding, Individually evaluated for impairment   1,256    
Loans Outstanding, Collectively evaluated for impairment   234,807    
PCI Loans   374    
Loans Outstanding, Ending Balance   236,437    
Allowance for credit losses, Individually evaluated for impairment   47    
Allowance for credit losses, Collectively evaluated for impairment   2,456    
Allowance for credit losses, PCI   1    
Allowance for credit losses, Ending balance 816 2,504 2,390 2,433
Loans receivable | Residential | Residential mortgage        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loans Outstanding, Individually evaluated for impairment   15,991    
Loans Outstanding, Collectively evaluated for impairment   1,092,046    
PCI Loans   9,579    
Loans Outstanding, Ending Balance   1,117,616    
Allowance for credit losses, Individually evaluated for impairment   782    
Allowance for credit losses, Collectively evaluated for impairment   7,296    
Allowance for credit losses, PCI   3    
Allowance for credit losses, Ending balance 11,063 8,081 8,345 8,295
Loans receivable | Residential | Home equity lines of credit        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loans Outstanding, Individually evaluated for impairment   992    
Loans Outstanding, Collectively evaluated for impairment   658,273    
PCI Loans   1,410    
Loans Outstanding, Ending Balance   660,675    
Allowance for credit losses, Individually evaluated for impairment   16    
Allowance for credit losses, Collectively evaluated for impairment   4,541    
Allowance for credit losses, PCI   18    
Allowance for credit losses, Ending balance 6,887 4,575 4,797 4,752
Loans receivable | Consumer        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loans Outstanding, Individually evaluated for impairment   214    
Loans Outstanding, Collectively evaluated for impairment   127,682    
PCI Loans   336    
Loans Outstanding, Ending Balance   128,232    
Allowance for credit losses, Individually evaluated for impairment   5    
Allowance for credit losses, Collectively evaluated for impairment   885    
Allowance for credit losses, PCI   11    
Allowance for credit losses, Ending balance $ 430 $ 901 $ 837 $ 853