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Loan and Lease Finance Receivables and Allowance for Credit Losses - Summary of Internal Risk Grouping by Loan Class (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Total loans excluding held-for-sale $ 3,479,797 $ 3,532,771
Total gross loans 3,479,797 3,538,783
Commercial & industrial 573,571 523,950
Residential real estate (SFR 1-4) 160,703 179,731
Dairy and livestock 327,579 343,549
Agribusiness 14,732 28,523
Municipal lease finance receivables 105,767 113,629
Consumer 53,894 59,789
Auto and equipment leases 12,716 17,370
Non-covered loans held-for-sale   348
Covered loans held-for-sale   5,664
Non-Covered Loans [Member]
   
Total loans excluding held-for-sale 3,259,238 3,225,122
Commercial & industrial 547,422 494,299
Construction - speculative 37,894 63,455
Construction - non-speculative 21,827 12,691
Commercial real estate - owner occupied 703,967 699,958
Commercial real estate - non-owner occupied 1,286,140 1,248,334
Residential real estate (SFR 1-4) 159,288 176,442
Dairy and livestock 327,579 343,350
Agribusiness 9,081 4,327
Municipal lease finance receivables 105,767 113,460
Consumer 47,557 51,436
Auto and equipment leases 12,716 17,370
Total non-covered loans 3,259,238 3,225,122
Covered loans 220,559 307,649
Non-covered loans held-for-sale   348
Covered loans held-for-sale   5,664
Pass [Member]
   
Total loans excluding held-for-sale 2,005,654 1,927,860
Total gross loans 2,005,654 1,928,208
Pass [Member] | Non-Covered Loans [Member]
   
Commercial & industrial 347,275 323,653
Construction - speculative 1,417 2,654
Construction - non-speculative 9,841 1,314
Commercial real estate - owner occupied 382,111 370,801
Commercial real estate - non-owner occupied 888,777 836,465
Residential real estate (SFR 1-4) 129,730 143,841
Dairy and livestock 67,144 73,074
Agribusiness 4,969 2,800
Municipal lease finance receivables 72,432 70,781
Consumer 40,650 42,295
Auto and equipment leases 8,671 11,742
Total non-covered loans 1,953,017 1,879,420
Covered loans 52,637 48,440
Non-covered loans held-for-sale   348
Watch List [Member]
   
Total loans excluding held-for-sale 729,918 680,462
Total gross loans 729,918 680,462
Watch List [Member] | Non-Covered Loans [Member]
   
Commercial & industrial 131,186 94,059
Construction - non-speculative 2,767 137
Commercial real estate - owner occupied 159,653 176,958
Commercial real estate - non-owner occupied 214,901 193,751
Residential real estate (SFR 1-4) 10,215 8,336
Dairy and livestock 108,087 106,024
Agribusiness 3,306 860
Municipal lease finance receivables 20,237 23,106
Consumer 3,538 3,474
Auto and equipment leases 3,225 39
Total non-covered loans 657,115 606,744
Covered loans 72,803 73,718
Special Mention [Member]
   
Total loans excluding held-for-sale 366,787 400,507
Total gross loans 366,787 400,507
Special Mention [Member] | Non-Covered Loans [Member]
   
Commercial & industrial 44,466 55,140
Construction - speculative 15,163 25,610
Construction - non-speculative   687
Commercial real estate - owner occupied 78,087 74,315
Commercial real estate - non-owner occupied 105,121 108,798
Residential real estate (SFR 1-4) 3,107 6,807
Dairy and livestock 74,510 91,416
Agribusiness 806 667
Municipal lease finance receivables 11,124 8,927
Consumer 1,976 3,906
Auto and equipment leases 738 3,506
Total non-covered loans 335,098 379,779
Covered loans 31,689 20,728
Substandard [Member]
   
Total loans excluding held-for-sale 375,597 520,740
Total gross loans 375,597 526,404
Substandard [Member] | Non-Covered Loans [Member]
   
Commercial & industrial 22,901 21,447
Construction - speculative 21,314 35,191
Construction - non-speculative 9,219 10,553
Commercial real estate - owner occupied 84,116 77,884
Commercial real estate - non-owner occupied 77,341 108,482
Residential real estate (SFR 1-4) 16,236 17,458
Dairy and livestock 77,721 72,619
Municipal lease finance receivables 1,974 10,646
Consumer 1,339 1,740
Auto and equipment leases 82 522
Total non-covered loans 312,243 356,542
Covered loans 63,354 164,198
Covered loans held-for-sale   5,664
Doubtful & Loss [Member]
   
Total loans excluding held-for-sale 1,841 3,202
Total gross loans 1,841 3,202
Doubtful & Loss [Member] | Non-Covered Loans [Member]
   
Commercial & industrial 1,594  
Commercial real estate - non-owner occupied   838
Dairy and livestock 117 217
Consumer 54 21
Auto and equipment leases   1,561
Total non-covered loans 1,765 2,637
Covered loans $ 76 $ 565