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Carrying Amount and Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Assets
Securities available for sale	$ 220,856		$ 366,173
Securities held to maturity	72,607		72,490
FDIC indemnification asset	14,332	$ 16,431	20,844	$ 22,049	$ 23,653	$ 27,900
Interest receivable	5,498		6,007
Liabilities
Derivative financial liabilities	450		251
Carrying (Reported) Amount, Fair Value Disclosure
Assets
Cash and cash equivalents	65,929		51,787
Securities available for sale	220,856		366,173
Securities held to maturity	72,182		72,541
Loans held for investment, net of allowance	1,816,751		1,686,308
FDIC indemnification asset	14,332		20,844
Interest receivable	5,498		6,007
Deferred compensation assets	3,842		3,464
Liabilities
Securities sold under agreements to repurchase	118,532		138,614
Interest payable	1,252		1,260
FHLB and other borrowings	105,707		80,756
Derivative financial liabilities	450		251
Deferred compensation liabilities	3,842		3,464
Carrying (Reported) Amount, Fair Value Disclosure | Demand Deposits
Liabilities
Deposits Fair Value	473,509		451,511
Carrying (Reported) Amount, Fair Value Disclosure | Interest-bearing Deposits
Liabilities
Deposits Fair Value	339,563		347,705
Carrying (Reported) Amount, Fair Value Disclosure | Savings Deposits
Liabilities
Deposits Fair Value	441,724		530,585
Carrying (Reported) Amount, Fair Value Disclosure | Bank Time Deposits
Liabilities
Deposits Fair Value	527,103		543,458
Estimate of Fair Value, Fair Value Disclosure
Assets
Cash and cash equivalents	65,929		51,787
Securities available for sale	220,856		366,173
Securities held to maturity	72,607		72,490
Loans held for investment, net of allowance	1,833,791		1,685,061
FDIC indemnification asset	7,226		10,753
Interest receivable	5,498		6,007
Deferred compensation assets	3,842		3,464
Liabilities
Securities sold under agreements to repurchase	120,070		140,880
Interest payable	1,252		1,260
FHLB and other borrowings	110,172		85,774
Derivative financial liabilities	450		251
Deferred compensation liabilities	3,842		3,464
Estimate of Fair Value, Fair Value Disclosure | Demand Deposits
Liabilities
Deposits Fair Value	473,509		451,511
Estimate of Fair Value, Fair Value Disclosure | Interest-bearing Deposits
Liabilities
Deposits Fair Value	339,563		347,705
Estimate of Fair Value, Fair Value Disclosure | Savings Deposits
Liabilities
Deposits Fair Value	441,724		530,585
Estimate of Fair Value, Fair Value Disclosure | Bank Time Deposits
Liabilities
Deposits Fair Value	528,183		541,059
Level 1
Assets
Cash and cash equivalents	65,929		51,787
Securities available for sale	55		54
Deferred compensation assets	3,842		3,464
Liabilities
Deferred compensation liabilities	3,842		3,464
Level 2
Assets
Securities available for sale	220,801		366,119
Securities held to maturity	72,607		72,490
Loans held for investment, net of allowance	4,464		4,886
Interest receivable	5,498		6,007
Liabilities
Securities sold under agreements to repurchase	120,070		140,880
Interest payable	1,252		1,260
FHLB and other borrowings	110,172		85,774
Derivative financial liabilities	450		251
Level 2 | Demand Deposits
Liabilities
Deposits Fair Value	473,509		451,511
Level 2 | Interest-bearing Deposits
Liabilities
Deposits Fair Value	339,563		347,705
Level 2 | Savings Deposits
Liabilities
Deposits Fair Value	441,724		530,585
Level 2 | Bank Time Deposits
Liabilities
Deposits Fair Value	528,183		541,059
Level 3
Assets
Loans held for investment, net of allowance	1,829,327		1,680,175
FDIC indemnification asset	$ 7,226		$ 10,753

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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