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Note 7 - Loans (Details) - Aging of Loan Portfolio - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans past due $ 113,788 $ 78,466
Non-accrual loans 44,643 52,130
Loans not past due 10,249,859 10,084,986
Loans 10,363,647 10,163,452
Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans past due 60,081 22,854
Financing Receivables, 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans past due 9,064 3,482
Commercial Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans past due 45,894 12,133
Non-accrual loans 2,645 3,545
Loans not past due 2,205,293 2,304,730
Loans 2,251,187 2,316,863
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans past due 35,329 8,367
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans past due 7,920 221
Real Estate Construction Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans past due 7,708 23,591
Non-accrual loans 6,179 16,306
Loans not past due 445,761 417,952
Loans 453,469 441,543
Real Estate Construction Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans past due 1,529 7,285
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans past due 46,817 29,697
Non-accrual loans 28,537 25,231
Loans not past due 5,398,758 5,271,521
Loans 5,445,575 5,301,218
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans past due 17,136 2,243
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans past due 1,144 2,223
Residential Mortgage Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans past due 13,369 13,045
Non-accrual loans 7,282 7,048
Loans not past due 2,198,703 2,088,290
Loans 2,212,072 2,101,335
Residential Mortgage Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans past due 6,087 4,959
Residential Mortgage Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans past due   1,038
Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans not past due 1,344 2,493
Loans $ 1,344 $ 2,493