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Loan and Lease Finance Receivables and Allowance for Loan Losses - Summary of Internal Risk Grouping by Loan Class (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Commercial and industrial $ 531,391 $ 573,571
SFR mortgage 192,457 160,703
Dairy & livestock and agribusiness 265,297 342,311
Municipal lease finance receivables 99,188 105,767
Consumer and other loans 57,988 66,610
Covered loans 177,863 220,559
Total gross loans 3,468,334 3,479,797
Non-Covered Loans [Member]
   
Commercial and industrial 510,566 547,422
Commercial real estate Owner occupied 725,556 703,967
Commercial real estate Non-owner occupied 1,400,859 1,286,140
Construction Speculative 27,126 37,894
Construction Non-speculative 20,522 21,827
SFR mortgage 192,130 159,288
Dairy & livestock and agribusiness 261,638 336,660
Municipal lease finance receivables 99,188 105,767
Consumer and other loans 52,886 60,273
Total non-covered loans 3,290,471 3,259,238
Total gross loans 3,290,471 3,259,238
Pass [Member]
   
Covered loans 35,125 52,637
Total gross loans 2,130,263 2,005,654
Pass [Member] | Non-Covered Loans [Member]
   
Commercial and industrial 308,271 347,275
Commercial real estate Owner occupied 441,739 382,111
Commercial real estate Non-owner occupied 1,040,758 888,777
Construction Speculative 7,568 1,417
Construction Non-speculative 6,408 9,841
SFR mortgage 152,169 129,730
Dairy & livestock and agribusiness 44,735 72,113
Municipal lease finance receivables 51,935 72,432
Consumer and other loans 41,555 49,321
Total non-covered loans 2,095,138 1,953,017
Watch List [Member]
   
Covered loans 67,347 72,803
Total gross loans 636,308 729,918
Watch List [Member] | Non-Covered Loans [Member]
   
Commercial and industrial 131,118 131,186
Commercial real estate Owner occupied 128,887 159,653
Commercial real estate Non-owner occupied 217,822 214,901
Construction Non-speculative 4,895 2,767
SFR mortgage 20,960 10,215
Dairy & livestock and agribusiness 39,360 111,393
Municipal lease finance receivables 19,540 20,237
Consumer and other loans 6,379 6,763
Total non-covered loans 568,961 657,115
Special Mention [Member]
   
Covered loans 23,477 31,689
Total gross loans 385,722 366,787
Special Mention [Member] | Non-Covered Loans [Member]
   
Commercial and industrial 53,972 44,466
Commercial real estate Owner occupied 89,475 78,087
Commercial real estate Non-owner occupied 85,784 105,121
Construction Speculative 1,538 15,163
SFR mortgage 4,319 3,107
Dairy & livestock and agribusiness 102,464 75,316
Municipal lease finance receivables 21,283 11,124
Consumer and other loans 3,410 2,714
Total non-covered loans 362,245 335,098
Substandard [Member]
   
Covered loans 51,914 63,354
Total gross loans 313,363 375,597
Substandard [Member] | Non-Covered Loans [Member]
   
Commercial and industrial 16,730 22,901
Commercial real estate Owner occupied 65,455 84,116
Commercial real estate Non-owner occupied 56,495 77,341
Construction Speculative 18,020 21,314
Construction Non-speculative 9,219 9,219
SFR mortgage 14,682 16,236
Dairy & livestock and agribusiness 72,879 77,721
Municipal lease finance receivables 6,430 1,974
Consumer and other loans 1,539 1,421
Total non-covered loans 261,449 312,243
Doubtful & Loss [Member]
   
Covered loans   76
Total gross loans 2,678 1,841
Doubtful & Loss [Member] | Non-Covered Loans [Member]
   
Commercial and industrial 475 1,594
Commercial real estate Owner occupied     
Commercial real estate Non-owner occupied     
Construction Speculative     
Construction Non-speculative     
SFR mortgage     
Dairy & livestock and agribusiness 2,200 117
Municipal lease finance receivables     
Consumer and other loans 3 54
Total non-covered loans $ 2,678 $ 1,765