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Loan and Lease Finance Receivables and Allowance for Loan 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 | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | $ 114,917 | $ 108,390
Unpaid Principal Balance | 132,817 | 125,631
Related Allowance | 4,856 | 2,332
Average Recorded Investment | 118,854 | 110,479
Interest Income Recognized | 1,417 | 2,300
With no related allowance recorded [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 103,932 | 99,925
Unpaid Principal Balance | 121,068 | 116,800
Average Recorded Investment | 106,957 | 102,609
Interest Income Recognized | 1,395 | 2,227
With no related allowance recorded [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 3,158 | 3,385
Unpaid Principal Balance | 4,079 | 4,215
Average Recorded Investment | 3,280 | 3,766
Interest Income Recognized | 35 | 43
With no related allowance recorded [Member] | Commercial Real Estate Owner occupied [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 12,316 | 13,478
Unpaid Principal Balance | 13,445 | 14,569
Average Recorded Investment | 12,742 | 14,459
Interest Income Recognized | 235 | 397
With no related allowance recorded [Member] | Commercial real estate Non-owner occupied [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 27,298 | 28,639
Unpaid Principal Balance | 38,081 | 38,633
Average Recorded Investment | 27,787 | 29,801
Interest Income Recognized | 406 | 670
With no related allowance recorded [Member] | Construction Speculative [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 18,146 | 21,314
Unpaid Principal Balance | 18,607 | 21,607
Average Recorded Investment | 18,230 | 21,650
Interest Income Recognized | 154 | 311
With no related allowance recorded [Member] | Construction Non-speculative [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 9,219 | 9,219
Unpaid Principal Balance | 9,219 | 9,219
Average Recorded Investment | 9,219 | 9,219
Interest Income Recognized | 284 | 574
With no related allowance recorded [Member] | SFR Mortgage [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 10,571 | 11,079
Unpaid Principal Balance | 13,303 | 14,342
Average Recorded Investment | 10,690 | 11,292
Interest Income Recognized | 33 | 54
With no related allowance recorded [Member] | Dairy & Livestock and Agribusiness [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 23,085 | 12,406
Unpaid Principal Balance | 24,138 | 13,756
Average Recorded Investment | 24,868 | 11,834
Interest Income Recognized | 248 | 173
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 and Other Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 139 | 142
Unpaid Principal Balance | 196 | 196
Average Recorded Investment | 141 | 145
With a related allowance recorded [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 10,985 | 8,465
Unpaid Principal Balance | 11,749 | 8,831
Related Allowance | 4,856 | 2,332
Average Recorded Investment | 11,897 | 7,870
Interest Income Recognized | 22 | 73
With a related allowance recorded [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 3,013 | 304
Unpaid Principal Balance | 3,131 | 327
Related Allowance | 1,905 | 289
Average Recorded Investment | 3,108 | 387
With a related allowance recorded [Member] | Commercial Real Estate Owner occupied [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 9 | 19
Unpaid Principal Balance | 10 | 19
Related Allowance | 1 | 2
Average Recorded Investment | 13 | 28
With a related allowance recorded [Member] | Commercial real estate Non-owner occupied [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 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] | SFR Mortgage [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 2,869 | 3,766
Unpaid Principal Balance | 3,010 | 4,071
Related Allowance | 351 | 434
Average Recorded Investment | 2,877 | 3,363
With a related allowance recorded [Member] | Dairy & Livestock and Agribusiness [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 5,076 | 4,303
Unpaid Principal Balance | 5,578 | 4,340
Related Allowance | 2,593 | 1,596
Average Recorded Investment | 5,879 | 4,017
Interest Income Recognized | 22 | 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 and Other Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment | 18 | 73
Unpaid Principal Balance | 20 | 74
Related Allowance | 6 | 11
Average Recorded Investment | $ 20 | $ 75

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5258-111524 + Details
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