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Note 7 - Loans - Aging of Loan Portfolio (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Loans past due $ 127,769 $ 126,826
Non-accrual loans 47,956 49,682
Loans not past due 11,237,740 11,074,449
Loans 11,365,509 11,201,275
Financing Receivables, 30 to 59 Days Past Due [Member]    
Loans past due 65,646 43,419
Financing Receivables, 60 to 89 Days Past Due [Member]    
Loans past due 14,167 33,725
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Loans past due
Commercial Portfolio Segment [Member]    
Loans past due 41,862 65,653
Non-accrual loans 13,865 15,710
Loans not past due 2,110,407 2,182,534
Loans 2,152,269 2,248,187
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Loans past due 27,682 22,753
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Loans past due 315 27,190
Commercial Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Loans past due
Real Estate Construction Portfolio Segment [Member]    
Loans past due 8,406 21,683
Non-accrual loans 5,361 5,458
Loans not past due 545,812 526,405
Loans 554,218 548,088
Real Estate Construction Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Loans past due 3,045 10,390
Real Estate Construction Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Loans past due 5,835
Real Estate Construction Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Loans past due
Commercial Real Estate Portfolio Segment [Member]    
Loans past due 65,821 26,664
Non-accrual loans 21,117 20,078
Loans not past due 5,840,263 5,758,584
Loans 5,906,084 5,785,248
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Loans past due 30,852 5,886
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Loans past due 13,852 700
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Loans past due
Residential Mortgage and Equity Lines Portfolio Segment [Member]    
Loans past due 11,680 12,826
Non-accrual loans 7,613 8,436
Loans not past due 2,736,674 2,602,933
Loans 2,748,354 2,615,759
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Loans past due 4,067 4,390
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Loans past due
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Loans past due
Consumer Portfolio Segment [Member]    
Loans past due
Non-accrual loans
Loans not past due 4,584 3,993
Loans 4,584 3,993
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Loans past due
Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Loans past due
Consumer Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Loans past due