Annual report pursuant to Section 13 and 15(d)

LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - ALLL Attributable to Loans by Portfolio Segment (Details)

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LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - ALLL Attributable to Loans by Portfolio Segment (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Attributable to loans collectively evaluated for impairment $ 650,000 $ 616,000    
Attributable to loans individually evaluated for impairment 41,000 22,000    
Total ALLL balance: 691,000 638,000 $ 598,000 $ 605,000
Collectively evaluated for impairment 68,760,000 65,904,000    
Financing Receivable Evaluated For Impairment 70,024,000 66,880,000    
Individually evaluated for impairment 1,223,000 874,000    
Purchase credit-impaired        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Attributable to loans collectively evaluated for impairment 0 0    
Collectively evaluated for impairment 41,000 102,000    
Commercial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total ALLL balance: 482,000 451,000 399,000 390,000
Financing Receivable Evaluated For Impairment 35,332,000 35,360,000    
Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total ALLL balance: 209,000 187,000 $ 199,000 $ 215,000
Financing Receivable Evaluated For Impairment $ 34,692,000 $ 31,520,000