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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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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



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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-Section 50

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953550-111524

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Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

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+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(4)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524

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