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Note 7 - Loans (Details) - Aging of Loan Portfolio - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Type of Loans:    
Loans past due $ 93,348 $ 112,401
Non-accrual loans 66,052 70,163
Loans not past due 9,408,660 8,801,679
Loans 9,502,008 8,914,080
Financing Receivables, 30 to 59 Days Past Due [Member]    
Type of Loans:    
Loans past due 21,773 36,359
Financing Receivables, 60 to 89 Days Past Due [Member]    
Type of Loans:    
Loans past due 5,523 5,879
Commercial Portfolio Segment [Member]    
Type of Loans:    
Loans past due 27,657 19,816
Non-accrual loans 7,878 6,983
Loans not past due 2,359,793 2,362,677
Loans 2,387,450 2,382,493
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Type of Loans:    
Loans past due 17,641 11,595
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Type of Loans:    
Loans past due 2,138 1,238
Real Estate Construction Portfolio Segment [Member]    
Type of Loans:    
Loans past due 16,856 21,379
Non-accrual loans 16,856 19,963
Loans not past due 353,972 277,275
Loans 370,828 298,654
Real Estate Construction Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Type of Loans:    
Loans past due   1,416
Commercial Real Estate Portfolio Segment [Member]    
Type of Loans:    
Loans past due 40,554 57,169
Non-accrual loans 33,271 35,606
Loans not past due 4,808,827 4,429,274
Loans 4,849,381 4,486,443
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Type of Loans:    
Loans past due 4,132 17,654
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Type of Loans:    
Loans past due 3,151 3,909
Residential Mortgage and Equity Lines Portfolio Segment [Member]    
Type of Loans:    
Loans past due 8,281 13,977
Non-accrual loans 8,047 7,611
Loans not past due 1,881,098 1,728,961
Loans 1,889,379 1,742,938
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Type of Loans:    
Loans past due   5,634
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Type of Loans:    
Loans past due 234 732
Consumer Portfolio Segment [Member]    
Type of Loans:    
Loans past due   60
Loans not past due 4,970 3,492
Loans $ 4,970 3,552
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Type of Loans:    
Loans past due   $ 60