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Note 7 - Loans (Details) - Allowance for Loan Losses by Portfolio Segment and Based on Impairment Method - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Loans individually evaluated for impairment    
Loans individually evaluated for impairment, allowance $ 7,190 $ 7,749
Loans individually evaluated for impairment, balance 134,815 133,810
Loans collectively evaluated for impairment    
Loans collectively evaluated for impairment, allowance 127,362 131,214
Loans collectively evaluated for impairment, balance 10,228,832 10,029,642
Loans, allowance 134,552 138,963
Loans 10,363,647 10,163,452
Commercial Portfolio Segment [Member]    
Loans individually evaluated for impairment    
Loans individually evaluated for impairment, allowance 225 530
Loans individually evaluated for impairment, balance 11,686 13,568
Loans collectively evaluated for impairment    
Loans collectively evaluated for impairment, allowance 56,156 55,669
Loans collectively evaluated for impairment, balance 2,239,501 2,303,295
Loans, allowance 56,381 56,199
Loans 2,251,187 2,316,863
Real Estate Construction Portfolio Segment [Member]    
Loans individually evaluated for impairment    
Loans individually evaluated for impairment, balance 11,857 22,002
Loans collectively evaluated for impairment    
Loans collectively evaluated for impairment, allowance 12,744 22,170
Loans collectively evaluated for impairment, balance 441,612 419,541
Loans, allowance 12,744 22,170
Loans 453,469 441,543
Commercial Real Estate Portfolio Segment [Member]    
Loans individually evaluated for impairment    
Loans individually evaluated for impairment, allowance 6,593 6,792
Loans individually evaluated for impairment, balance 94,145 81,776
Loans collectively evaluated for impairment    
Loans collectively evaluated for impairment, allowance 43,858 42,648
Loans collectively evaluated for impairment, balance 5,351,430 5,219,442
Loans, allowance 50,451 49,440
Loans 5,445,575 5,301,218
Residential Mortgage and Equity Lines Portfolio Segment [Member]    
Loans individually evaluated for impairment    
Loans individually evaluated for impairment, allowance 372 427
Loans individually evaluated for impairment, balance 17,127 16,464
Loans collectively evaluated for impairment    
Loans collectively evaluated for impairment, allowance 14,597 10,718
Loans collectively evaluated for impairment, balance 2,194,945 2,084,871
Loans, allowance 14,969 11,145
Loans 2,212,072 2,101,335
Consumer Portfolio Segment [Member]    
Loans collectively evaluated for impairment    
Loans collectively evaluated for impairment, allowance 7 9
Loans collectively evaluated for impairment, balance 1,344 2,493
Loans, allowance 7 9
Loans $ 1,344 $ 2,493