Other Borrowings - Summary of Other Borrowings (Parenthetical) (Detail)	6 Months Ended
	Jun. 30, 2014
Federal Home Loan Bank Advances [Member]
Federal Home Loan Bank Borrowings By Year Of Maturity And Applicable Interest Rate [Line Items]
Federal Home Loan Bank daily credit effective rate	0.36%
Revolving Credit Facility [Member]
Federal Home Loan Bank Borrowings By Year Of Maturity And Applicable Interest Rate [Line Items]
Interest rate description	90-day LIBOR plus 4.00% (4.23% at June 30, 2014)
Interest rate, margin to be added	4.00%
90-day LIBOR interest rate at period end	4.23%
Maturity period of Federal Home Loan Bank advances	2016-08
Correspondent Bank Advances [Member]
Federal Home Loan Bank Borrowings By Year Of Maturity And Applicable Interest Rate [Line Items]
Correspondent bank advances effective rate	4.50%
Maturity period of advances	Nov. 27, 2017
Subordinated Debt One [Member]
Federal Home Loan Bank Borrowings By Year Of Maturity And Applicable Interest Rate [Line Items]
Interest rate description	90-day LIBOR plus 1.60% (1.84% at June 30, 2014)
Interest rate, margin to be added	1.60%
90-day LIBOR interest rate at period end	1.84%
Maturity period of Federal Home Loan Bank advances	2014-06
Subordinated Debt Two [Member]
Federal Home Loan Bank Borrowings By Year Of Maturity And Applicable Interest Rate [Line Items]
Interest rate description	90-day LIBOR plus 1.75% (1.98% at June 30, 2014)
Interest rate, margin to be added	1.75%
90-day LIBOR interest rate at period end	1.98%
Maturity period of Federal Home Loan Bank advances	2014-06
Fixed Rate Advance One [Member] | Federal Home Loan Bank Advances [Member]
Federal Home Loan Bank Borrowings By Year Of Maturity And Applicable Interest Rate [Line Items]
Federal Home Loan Bank daily credit effective rate	0.20%
Maturity period of advances	Jul. 02, 2014
Fixed Rate Advance Two [Member] | Federal Home Loan Bank Advances [Member]
Federal Home Loan Bank Borrowings By Year Of Maturity And Applicable Interest Rate [Line Items]
Federal Home Loan Bank Advances effective rate	0.21%
Maturity period of advances	Jul. 16, 2014
Fixed Rate Advance Three [Member] | Federal Home Loan Bank Advances [Member]
Federal Home Loan Bank Borrowings By Year Of Maturity And Applicable Interest Rate [Line Items]
Federal Home Loan Bank Advances effective rate	0.19%
Maturity period of advances	Jul. 23, 2014
Fixed Rate Advance Four [Member] | Federal Home Loan Bank Advances [Member]
Federal Home Loan Bank Borrowings By Year Of Maturity And Applicable Interest Rate [Line Items]
Federal Home Loan Bank Advances effective rate	0.17%
Maturity period of advances	Jan. 24, 2014