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Note 8 - Loans (Details) - Allowance for Loan Losses by Portfolio Segment and Based on Impairment Method - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Loans individually evaluated for impairment    
Loans individually evaluated for impairment, allowance $ 14,323 $ 11,798
Loans individually evaluated for impairment, balance 161,121 174,519
Loans collectively evaluated for impairment    
Loans collectively evaluated for impairment, allowance 135,753 149,622
Loans collectively evaluated for impairment, balance 9,878,811 8,739,561
Loans, allowance 150,076 161,420
Loans 10,039,932 8,914,080
Commercial Portfolio Segment [Member]    
Loans individually evaluated for impairment    
Loans individually evaluated for impairment, allowance 7,561 1,263
Loans individually evaluated for impairment, balance 27,630 23,489
Loans collectively evaluated for impairment    
Loans collectively evaluated for impairment, allowance 47,316 46,238
Loans collectively evaluated for impairment, balance 2,334,429 2,359,004
Loans, allowance 54,877 47,501
Loans 2,362,059 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 22,292 25,728
Loans collectively evaluated for impairment    
Loans collectively evaluated for impairment, allowance 26,466 26,575
Loans collectively evaluated for impairment, balance 382,986 272,926
Loans, allowance 26,466 27,652
Loans 405,278 298,654
Commercial Real Estate Portfolio Segment [Member]    
Loans individually evaluated for impairment    
Loans individually evaluated for impairment, allowance 6,389 8,993
Loans individually evaluated for impairment, balance 95,019 109,194
Loans collectively evaluated for impairment    
Loans collectively evaluated for impairment, allowance 49,644 65,680
Loans collectively evaluated for impairment, balance 5,180,551 4,377,249
Loans, allowance 56,033 74,673
Loans 5,275,570 4,486,443
Residential Mortgage and Equity Lines Portfolio Segment [Member]    
Loans individually evaluated for impairment    
Loans individually evaluated for impairment, allowance 373 465
Loans individually evaluated for impairment, balance 16,180 16,108
Loans collectively evaluated for impairment    
Loans collectively evaluated for impairment, allowance 12,304 11,113
Loans collectively evaluated for impairment, balance 1,975,074 1,726,830
Loans, allowance 12,677 11,578
Loans 1,991,254 1,742,938
Consumer Portfolio Segment [Member]    
Loans collectively evaluated for impairment    
Loans collectively evaluated for impairment, allowance 23 16
Loans collectively evaluated for impairment, balance 5,771 3,552
Loans, allowance 23 16
Loans $ 5,771 $ 3,552