Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Estimated Fair Values of Financial Instruments (Detail)

v2.4.0.8
Fair Value Measurements - Estimated Fair Values of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Financial assets:    
Available-for-Sale, Estimated Fair Value $ 1,128,624 $ 530,926
Accrued interest receivable 9,880 7,055
Investment in federal reserve bank stock 12,273 11,196
Financial liabilities:    
Noninterest-bearing deposits 1,029,343 819,015
Interest-bearing deposits 2,568,811 1,693,310
Accrued interest payable 3,030 3,366
Carrying Amount [Member]
    
Financial assets:    
Cash and cash equivalents 197,016 179,357
Available-for-Sale, Estimated Fair Value 1,128,624 530,926
Loans receivable, net of allowance for loan losses 2,628,091 2,177,498
Loans held for sale 7,757  
Accrued interest receivable 9,880 7,055
Servicing assets 7,844 6,833
Investment in federal home loan bank stock 17,579 14,060
Investment in federal reserve bank stock 12,273 11,196
Financial liabilities:    
Noninterest-bearing deposits 1,029,343 819,015
Interest-bearing deposits 2,568,811 1,693,310
Borrowings 128,509 127,546
Accrued interest payable 3,030 3,366
Off-balance sheet items:    
Commitments to extend credit 327,381 246,161
Standby letters of credit 9,140 8,926
Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets [Member]
    
Financial assets:    
Cash and cash equivalents 197,016 179,357
Available-for-Sale, Estimated Fair Value 172,956 103,533
Accrued interest receivable 9,880 7,055
Investment in federal home loan bank stock 17,579 14,060
Investment in federal reserve bank stock 12,273 11,196
Financial liabilities:    
Accrued interest payable 3,030 3,366
Fair Value [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member]
    
Financial assets:    
Available-for-Sale, Estimated Fair Value 954,500 426,645
Loans held for sale 7,757  
Financial liabilities:    
Noninterest-bearing deposits 1,029,343 819,015
Fair Value [Member] | Significant Unobservable Inputs [Member]
    
Financial assets:    
Available-for-Sale, Estimated Fair Value 1,168 748
Loans receivable, net of allowance for loan losses 2,686,838 2,204,069
Servicing assets 7,844 6,833
Financial liabilities:    
Interest-bearing deposits 2,565,504 1,693,739
Borrowings 128,509 247,249
Off-balance sheet items:    
Commitments to extend credit 327,381 246,161
Standby letters of credit $ 9,140 $ 8,926