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Securities - Maturity of Securities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Held for Investment, Contractual maturity of debt securities, Amortized Cost
Amortized cost, Within one year	$ 1,373us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount
Amortized cost, After one year but within five years	6,399us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount
Amortized cost, After five years but within ten years	368us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount
Amortized cost, After ten years	141us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount
Amortized Cost	8,281us-gaap_HeldToMaturitySecurities
Available for sale, Contractual maturity of debt securities, Amortized Cost
Amortized Cost, Within one year	91,839us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
Amortized Cost, After one year but within five years	333,138us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
Amortized Cost, After five years but within ten years	16,864us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
Amortized Cost, After ten years	84,514us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
Total debt securities	526,355us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Amortized Cost, Equity securities	7,447us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
Amortized Cost	533,802us-gaap_AvailableForSaleSecuritiesAmortizedCost
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value
Estimated Fair Value, Within one year	1,380us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue
Estimated Fair Value, After one year but within five years	6,429us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Estimated Fair Value, After five years but within ten years	383us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
Estimated Fair Value, After ten years	158us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue
Estimated Fair Value	8,350us-gaap_HeldToMaturitySecuritiesFairValue
Available for sale, Contractual maturity of debt securities, Estimated Fair Value
Estimated Fair Value, Within one year	91,928us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Estimated Fair Value, After one year but within five years	336,018us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Estimated Fair Value, After five years but within ten years	17,653us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
Estimated Fair Value, After ten years	85,341us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
Total debt securities	530,940us-gaap_AvailableForSaleSecuritiesDebtSecurities
Estimated Fair Value, Equity securities	10,904us-gaap_AvailableForSaleSecuritiesEquitySecurities
Estimated Fair Value, Total	$ 541,844us-gaap_AvailableForSaleSecurities

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- Definition

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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