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Loan and Lease Finance Receivables and Allowance for Credit Losses - Schedule of Held-for-Investment and Held-for-Sale Loans, Individually Evaluated for Impairment by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | $ 108,390 | $ 101,226
Unpaid Principal Balance | 125,631 | 119,497
Related Allowance | 2,332 | 2,968
Average Recorded Investment | 110,479 | 107,665
Interest Income Recognized | 2,300 | 2,225
With no related allowance recorded [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 99,925 | 90,022
Unpaid Principal Balance | 116,800 | 106,021
Related Allowance |  |
Average Recorded Investment | 102,609 | 95,339
Interest Income Recognized | 2,227 | 2,225
With no related allowance recorded [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 3,385 | 3,566
Unpaid Principal Balance | 4,215 | 4,630
Related Allowance |  |
Average Recorded Investment | 3,766 | 4,649
Interest Income Recognized | 43 | 93
With no related allowance recorded [Member] | Construction - speculative [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 21,314 | 13,317
Unpaid Principal Balance | 21,607 | 15,718
Related Allowance |  |
Average Recorded Investment | 21,650 | 15,434
Interest Income Recognized | 311 |
With no related allowance recorded [Member] | Construction - non-speculative [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 9,219 | 20,085
Unpaid Principal Balance | 9,219 | 20,085
Related Allowance |  |
Average Recorded Investment | 9,219 | 16,437
Interest Income Recognized | 574 | 1,123
With no related allowance recorded [Member] | Commercial real estate - owner occupied [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 13,478 | 13,567
Unpaid Principal Balance | 14,569 | 14,013
Related Allowance |  |
Average Recorded Investment | 14,459 | 11,941
Interest Income Recognized | 397 | 449
With no related allowance recorded [Member] | Commercial real estate - non-owner occupied [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 28,639 | 16,435
Unpaid Principal Balance | 38,633 | 23,656
Related Allowance |  |
Average Recorded Investment | 29,801 | 21,096
Interest Income Recognized | 670 | 67
With no related allowance recorded [Member] | Residential real estate (SFR 1-4) [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 11,079 | 14,069
Unpaid Principal Balance | 14,342 | 17,411
Related Allowance |  |
Average Recorded Investment | 11,292 | 15,120
Interest Income Recognized | 54 | 47
With no related allowance recorded [Member] | Dairy and livestock [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 12,406 | 8,879
Unpaid Principal Balance | 13,756 | 10,358
Related Allowance |  |
Average Recorded Investment | 11,834 | 10,535
Interest Income Recognized | 173 | 446
With no related allowance recorded [Member] | Municipal lease finance receivables [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 263 |
Unpaid Principal Balance | 263 |
Related Allowance |  |
Average Recorded Investment | 443 |
Interest Income Recognized | 5 |
With no related allowance recorded [Member] | Consumer [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 142 | 104
Unpaid Principal Balance | 196 | 150
Related Allowance |  |
Average Recorded Investment | 145 | 127
With no related allowance recorded [Member] | Auto and equipment leases [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment |  |
Unpaid Principal Balance |  |
Related Allowance |  |
Average Recorded Investment |  |
Interest Income Recognized |  |
With no related allowance recorded [Member] | Held-for-Sale Construction - Speculative [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment |  |
Unpaid Principal Balance |  |
Related Allowance |  |
Average Recorded Investment |  |
Interest Income Recognized |  |
With a Related Allowance Recorded [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 8,465 | 11,204
Unpaid Principal Balance | 8,831 | 13,476
Related Allowance | 2,332 | 2,968
Average Recorded Investment | 7,870 | 12,326
Interest Income Recognized | 73 |
With a Related Allowance Recorded [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 304 | 1,388
Unpaid Principal Balance | 327 | 1,410
Related Allowance | 289 | 165
Average Recorded Investment | 387 | 1,554
Interest Income Recognized |  |
With a Related Allowance Recorded [Member] | Construction - speculative [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment |  |
Unpaid Principal Balance |  |
Related Allowance |  |
Average Recorded Investment |  |
Interest Income Recognized |  |
With a Related Allowance Recorded [Member] | Construction - non-speculative [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment |  |
Unpaid Principal Balance |  |
Related Allowance |  |
Average Recorded Investment |  |
Interest Income Recognized |  |
With a Related Allowance Recorded [Member] | Commercial real estate - owner occupied [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 19 | 3,900
Unpaid Principal Balance | 19 | 3,900
Related Allowance | 2 | 928
Average Recorded Investment | 28 | 3,900
Interest Income Recognized |  |
With a Related Allowance Recorded [Member] | Commercial real estate - non-owner occupied [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment |  | 83
Unpaid Principal Balance |  | 85
Related Allowance |  | 5
Average Recorded Investment |  | 86
Interest Income Recognized |  |
With a Related Allowance Recorded [Member] | Residential real estate (SFR 1-4) [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 3,766 | 4,087
Unpaid Principal Balance | 4,071 | 4,369
Related Allowance | 434 | 406
Average Recorded Investment | 3,363 | 3,967
Interest Income Recognized |  |
With a Related Allowance Recorded [Member] | Dairy and livestock [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 4,303 | 1,372
Unpaid Principal Balance | 4,340 | 3,324
Related Allowance | 1,596 | 1,372
Average Recorded Investment | 4,017 | 2,402
Interest Income Recognized | 73 |
With a Related Allowance Recorded [Member] | Municipal lease finance receivables [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment |  |
Unpaid Principal Balance |  |
Related Allowance |  |
Average Recorded Investment |  |
Interest Income Recognized |  |
With a Related Allowance Recorded [Member] | Consumer [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 73 | 270
Unpaid Principal Balance | 74 | 278
Related Allowance | 11 | 77
Average Recorded Investment | 75 | 276
Interest Income Recognized |  |
With a Related Allowance Recorded [Member] | Auto and equipment leases [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment |  | 104
Unpaid Principal Balance |  | 110
Related Allowance |  | 15
Average Recorded Investment |  | 141
Interest Income Recognized |  |

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