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Note 5 - Loans - Aging of Loan Portfolio (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Loans past due $ 98,709 $ 126,826
Non-accrual loans 48,787 49,682
Loans not past due 12,771,581 11,074,449
Loans 12,870,290 11,201,275
Financing Receivables, 30 to 59 Days Past Due [Member]    
Loans past due 38,396 43,419
Financing Receivables, 60 to 89 Days Past Due [Member]    
Loans past due 11,526 33,725
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Loans past due
Commercial Portfolio Segment [Member]    
Loans past due 30,567 65,653
Non-accrual loans 14,296 15,710
Loans not past due 2,430,699 2,182,534
Loans 2,461,266 2,248,187
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Loans past due 11,079 22,753
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Loans past due 5,192 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 11,213 21,683
Non-accrual loans 8,185 5,458
Loans not past due 667,592 526,405
Loans 678,805 548,088
Real Estate Construction Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Loans past due 3,028 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 42,995 26,664
Non-accrual loans 19,820 20,078
Loans not past due 6,439,700 5,758,584
Loans 6,482,695 5,785,248
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Loans past due 17,573 5,886
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Loans past due 5,602 700
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 13,831 12,826
Non-accrual loans 6,486 8,436
Loans not past due 3,228,523 2,602,933
Loans 3,242,354 2,615,759
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Loans past due 6,613 4,390
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Loans past due 732
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 ]    
Loans past due 103
Non-accrual loans
Loans not past due 5,067 3,993
Loans 5,170 3,993
Installment and Other Loans [Member ] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Loans past due 103
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