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Note 7 - Loans (Details) - Allowance for Loan Losses by Portfolio Segment and Based on Impairment Method - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Loans individually evaluated for impairment    
Loans individually evaluated for impairment, allowance $ 7,984 $ 11,798
Loans individually evaluated for impairment, balance 166,064 174,519
Loans collectively evaluated for impairment    
Loans collectively evaluated for impairment, allowance 145,453 149,622
Loans collectively evaluated for impairment, balance 9,335,944 8,739,561
Loans, allowance 153,437 161,420
Loans 9,502,008 8,914,080
Commercial Portfolio Segment [Member]    
Loans individually evaluated for impairment    
Loans individually evaluated for impairment, allowance 966 1,263
Loans individually evaluated for impairment, balance 23,717 23,489
Loans collectively evaluated for impairment    
Loans collectively evaluated for impairment, allowance 46,574 46,238
Loans collectively evaluated for impairment, balance 2,363,733 2,359,004
Loans, allowance 47,540 47,501
Loans 2,387,450 2,382,493
Real Estate Construction Portfolio Segment [Member]    
Loans individually evaluated for impairment    
Loans individually evaluated for impairment, allowance   1,077
Loans individually evaluated for impairment, balance 22,586 25,728
Loans collectively evaluated for impairment    
Loans collectively evaluated for impairment, allowance 26,304 26,575
Loans collectively evaluated for impairment, balance 348,242 272,926
Loans, allowance 26,304 27,652
Loans 370,828 298,654
Commercial Real Estate Portfolio Segment [Member]    
Loans individually evaluated for impairment    
Loans individually evaluated for impairment, allowance 6,554 8,993
Loans individually evaluated for impairment, balance 102,874 109,194
Loans collectively evaluated for impairment    
Loans collectively evaluated for impairment, allowance 60,691 65,680
Loans collectively evaluated for impairment, balance 4,746,507 4,377,249
Loans, allowance 67,245 74,673
Loans 4,849,381 4,486,443
Residential Mortgage and Equity Lines Portfolio Segment [Member]    
Loans individually evaluated for impairment    
Loans individually evaluated for impairment, allowance 464 465
Loans individually evaluated for impairment, balance 16,887 16,108
Loans collectively evaluated for impairment    
Loans collectively evaluated for impairment, allowance 11,859 11,113
Loans collectively evaluated for impairment, balance 1,872,492 1,726,830
Loans, allowance 12,323 11,578
Loans 1,889,379 1,742,938
Consumer Portfolio Segment [Member]    
Loans collectively evaluated for impairment    
Loans collectively evaluated for impairment, allowance 25 16
Loans collectively evaluated for impairment, balance 4,970 3,552
Loans, allowance 25 16
Loans $ 4,970 $ 3,552