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Note 4 - Loans and Allowance for Credit Losses (Detail) - Loans by delinquency and nonaccrual status (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
30-89 Days Past Due and Accruing $ 27,489 $ 56,459
Past Due 90 days or More and Accruing 614 2,322
Total Loans 2,111,357 2,523,806
Current and Accruing 2,050,959 2,411,959
Nonaccrual 32,295 53,066
Originated Loans [Member] | Commercial Portfolio Segment [Member]
   
30-89 Days Past Due and Accruing 1,032 6,953
Total Loans 340,116 398,446
Current and Accruing 333,474 388,322
Nonaccrual 5,610 3,171
Originated Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
   
30-89 Days Past Due and Accruing 10,750 16,967
Past Due 90 days or More and Accruing   1,626
Total Loans 632,927 704,655
Current and Accruing 616,276 679,633
Nonaccrual 5,901 6,429
Originated Loans [Member] | Construction Portfolio Segment [Member]
   
30-89 Days Past Due and Accruing   570
Total Loans 7,984 14,580
Current and Accruing 7,984 10,664
Nonaccrual   3,346
Originated Loans [Member] | Residential Portfolio Segment [Member]
   
30-89 Days Past Due and Accruing 2,193 5,648
Total Loans 222,458 271,111
Current and Accruing 220,032 262,917
Nonaccrual 233 2,546
Originated Loans [Member] | Consumer Portfolio Segment [Member]
   
30-89 Days Past Due and Accruing 5,205 6,324
Past Due 90 days or More and Accruing 455 421
Total Loans 460,698 473,815
Current and Accruing 455,007 467,015
Nonaccrual 31 55
Originated Loans [Member]
   
30-89 Days Past Due and Accruing 19,180 36,462
Past Due 90 days or More and Accruing 455 2,047
Total Loans 1,664,183 1,862,607
Current and Accruing 1,632,773 1,808,551
Nonaccrual 11,775 15,547
Purchased Non-Covered Loans [Member]
   
30-89 Days Past Due and Accruing 1,821 1,095
Past Due 90 days or More and Accruing 4 34
Total Loans 74,891 125,921
Current and Accruing 65,567 101,585
Nonaccrual 7,499 23,207
Purchased Covered Loans [Member]
   
30-89 Days Past Due and Accruing 6,488 18,902
Past Due 90 days or More and Accruing 155 241
Total Loans 372,283 535,278
Current and Accruing 352,619 501,823
Nonaccrual 13,021 14,312
Commercial Portfolio Segment [Member]
   
Total Loans 401,331 513,362
Commercial Real Estate Portfolio Segment [Member]
   
Total Loans 916,594 1,114,496
Construction Portfolio Segment [Member]
   
Total Loans 16,515 34,437
Residential Portfolio Segment [Member]
   
Total Loans 234,035 286,727
Consumer Portfolio Segment [Member]
   
Total Loans $ 542,882 $ 574,784