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Borrowings - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Letters of credit provided for collateralize public unit deposits	$ 74,320,000
Pledged loans	965,090,000
Junior subordinated debentures
Debt Instrument [Line Items]
Junior subordinated debentures issued	$ 15,460,000
Debentures mature date	Oct. 08, 2033
Junior subordinated debentures | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, percentage points to be added to the reference rate	2.95%
Total FHLB Borrowings
Debt Instrument [Line Items]
Unused borrowing capacity	$ 495,150,000
Unsecured Line of Credit
Debt Instrument [Line Items]
Debt instrument, percentage points to be added to the reference rate	2.00%
Unsecured, committed line of credit, borrowing capacity	$ 15,000,000
Unsecured, committed line of credit, interest rate	One-month LIBOR plus 2.00%
Unsecured, committed line of credit, maturity date	Apr. 30, 2017
Unsecured, committed line of credit, outstanding amount	$ 0	$ 0

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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Amount of securities, mortgage loans, or other financial instruments pledged as collateral for deposits.

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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Date the credit facility terminates, in CCYY-MM-DD format.

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Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash inflow from a borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in liquidation of the entity's assets or underlying collateral.

+ References

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