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Note 7 - Loans - Aging of Loan Portfolio (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Non-accrual loans $ 64,044 $ 49,682
Loans past due 100,482 126,826
Loans not past due 11,470,750 11,074,449
Loans 11,571,232 11,201,275
Financing Receivables, 30 to 59 Days Past Due [Member]    
Loans past due 34,833 43,419
Financing Receivables, 60 to 89 Days Past Due [Member]    
Loans past due 1,110 33,725
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Loans past due 495
Commercial Portfolio Segment [Member]    
Non-accrual loans 13,064 15,710
Loans past due 46,485 65,653
Loans not past due 2,169,475 2,182,534
Loans 2,215,960 2,248,187
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Loans past due 32,411 22,753
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Loans past due 515 27,190
Commercial Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Loans past due 495
Real Estate Construction Portfolio Segment [Member]    
Non-accrual loans 16,585 5,458
Loans past due 16,585 21,683
Loans not past due 531,152 526,405
Loans 547,737 548,088
Real Estate Construction Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Loans past due 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]    
Non-accrual loans 27,448 20,078
Loans past due 29,821 26,664
Loans not past due 5,853,949 5,758,584
Loans 5,883,770 5,785,248
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Loans past due 2,258 5,886
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Loans past due 115 700
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]    
Non-accrual loans 6,947 8,436
Loans past due 7,591 12,826
Loans not past due 2,910,617 2,602,933
Loans 2,918,208 2,615,759
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Loans past due 164 4,390
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Loans past due 480
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Loans past due
Installment and Other Loans [Member ]    
Non-accrual loans
Loans past due
Loans not past due 5,557 3,993
Loans 5,557 3,993
Installment and Other Loans [Member ] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Loans past due
Installment and Other Loans [Member ] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Loans past due
Installment and Other Loans [Member ] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Loans past due