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Amortized Cost and Estimated Fair Values of Securities Available for Sale by Contractual Maturities and Historical Prepayments Based on Prior Twelve Months of Principal Payments (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, amortized cost, maturing in one year or less $ 6,814 $ 13,443
Securities available for sale, estimated fair value, maturing in one year or less 6,822 13,388
Weighted average yield, maturing in one year or less 2.13% 2.15%
Securities available for sale, amortized cost, maturing over one year through five years 29,690 44,574
Securities available for sale, estimated fair value, maturing over one year through five years 29,591 44,353
Weighted average yield, maturing over one year through five years 2.13% 2.32%
Securities available for sale, amortized cost, maturing over five years through ten years 30,410 38,950
Securities available for sale, estimated fair value, maturing over five years through ten years 30,533 39,087
Weighted average yield, maturing over five years through ten years 2.09% 2.43%
Securities available for sale, amortized cost, maturing over ten years 34,078 53,020
Securities available for sale, estimated fair value, maturing over ten years 32,166 51,081
Weighted average yield, maturing over ten years 2.01% 2.48%
Securities available for sale, amortized cost, total 100,992 149,987
Securities available for sale, estimated fair value, total $ 99,111 $ 147,909
Weighted average yield 2.07% 2.39%