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Carrying Amount and Fair Value of Company's Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets
Available-for-sale securities	$ 537,507	$ 534,358
FDIC indemnification asset	45,393	48,073
Accrued interest receivable	8,166	7,842
Carrying (Reported) Amount, Fair Value Disclosure
Assets
Cash and cash equivalents	167,041	144,847
Available-for-sale securities	537,507	534,358
Held-to-maturity securities	816	816
Loans held for sale	2,794	6,672
Loans held for investment less allowance	1,664,442	1,698,883
FDIC indemnification asset	45,393	48,073
Accrued interest receivable	8,166	7,842
Derivative financial assets	142	144
Deferred compensation assets	3,786	3,625
Liabilities
Securities sold under agreements to repurchase	121,506	136,118
Accrued interest payable	2,351	2,481
FHLB and other indebtedness	165,877	177,435
Derivative financial liabilities	10	16
Deferred compensation liabilities	3,786	3,625
Carrying (Reported) Amount, Fair Value Disclosure | Demand Deposits
Liabilities
Deposits Fair Value	355,918	343,352
Carrying (Reported) Amount, Fair Value Disclosure | Interest-bearing Deposits
Liabilities
Deposits Fair Value	377,445	353,321
Carrying (Reported) Amount, Fair Value Disclosure | Savings Deposits
Liabilities
Deposits Fair Value	513,322	500,276
Carrying (Reported) Amount, Fair Value Disclosure | Bank Time Deposits
Liabilities
Deposits Fair Value	800,812	833,226
Estimate of Fair Value, Fair Value Disclosure
Assets
Cash and cash equivalents	167,041	144,847
Available-for-sale securities	537,507	534,358
Held-to-maturity securities	824	832
Loans held for sale	2,820	6,774
Loans held for investment less allowance	1,661,139	1,702,128
FDIC indemnification asset	45,393	48,073
Accrued interest receivable	8,166	7,842
Derivative financial assets	142	144
Deferred compensation assets	3,786	3,625
Liabilities
Securities sold under agreements to repurchase	125,972	142,417
Accrued interest payable	2,351	2,481
FHLB and other indebtedness	192,853	200,418
Derivative financial liabilities	10	16
Deferred compensation liabilities	3,786	3,625
Estimate of Fair Value, Fair Value Disclosure | Demand Deposits
Liabilities
Deposits Fair Value	355,918	343,352
Estimate of Fair Value, Fair Value Disclosure | Interest-bearing Deposits
Liabilities
Deposits Fair Value	377,445	353,321
Estimate of Fair Value, Fair Value Disclosure | Savings Deposits
Liabilities
Deposits Fair Value	513,322	500,276
Estimate of Fair Value, Fair Value Disclosure | Bank Time Deposits
Liabilities
Deposits Fair Value	807,107	842,331
Level 1
Assets
Cash and cash equivalents	167,041	144,847
Available-for-sale securities	1,353	3,511
Deferred compensation assets	3,786	3,625
Liabilities
Deferred compensation liabilities	3,786	3,625
Level 2
Assets
Available-for-sale securities	536,154	530,847
Held-to-maturity securities	824	832
Loans held for sale	2,820	6,774
Accrued interest receivable	8,166	7,842
Derivative financial assets	142	144
Liabilities
Securities sold under agreements to repurchase	125,972	142,417
Accrued interest payable	2,351	2,481
FHLB and other indebtedness	192,853	200,418
Derivative financial liabilities	10	16
Level 2 | Demand Deposits
Liabilities
Deposits Fair Value	355,918	343,352
Level 2 | Interest-bearing Deposits
Liabilities
Deposits Fair Value	377,445	353,321
Level 2 | Savings Deposits
Liabilities
Deposits Fair Value	513,322	500,276
Level 2 | Bank Time Deposits
Liabilities
Deposits Fair Value	807,107	842,331
Level 3
Assets
Loans held for investment less allowance	1,661,139	1,702,128
FDIC indemnification asset	$ 45,393	$ 48,073

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Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date.

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Carrying amount of receivable assets originating from the indemnification agreement with the Federal Deposit Insurance Corporation (FDIC), in which the FDIC is to partially cover losses.

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