Investment Securities (Tables)

12 Months Ended

Dec. 31, 2014

Investments, Debt and Equity Securities [Abstract]

Available for Sale and Held to Maturity Investment

The amortized cost of investment securities and the approximate fair value at December 31, 2014 and 2013 were as follows:

SUMMARY OF INVESTMENT SECURITIES

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
December 31, 2014
Available for sale:
U.S. Treasury securities	$	2,499	$	4	$	—		$	2,503
U.S. Government agency securities		4,973		—		(187	)		4,786
U.S. Government agency mortgage-backed securities		263,215		2,992		(1,051	)		265,156
Other mortgage-backed securities		265		—		—			265
State and municipal securities		28,981		1,941		—			30,922
Trust preferred securities		12,014		—		(2,604	)		9,410
Collateralized Loan Obligations		69,931		—		(1,328	)		68,603
Other securities		12,855		—		—			12,855
Total available for sale		394,733		4,937		(5,170	)		394,500
Held to maturity:
U.S. Government agency mortgage-backed securities		239		12		—			251
Other securities		250		—		—			250
Total held to maturity		489		12		—			501
Total investment securities	$	395,222	$	4,949	$	(5,170	)	$	395,001
December 31, 2013
Available for sale:
U.S. Treasury securities	$	2,496	$	4	$	—		$	2,500
U.S. Government agency securities		4,969		—		(562	)		4,407
U.S. Government agency mortgage-backed securities		325,316		1,043		(8,295	)		318,064
Other mortgage-backed securities		277		16		—			293
State and municipal securities		29,240		1,213		—			30,453
Trust preferred securities		12,626		—		(4,659	)		7,967
Collateralized Loan Obligations		73,915				(686	)		73,229
Other securities		3,184		—		—			3,184
Total available for sale		452,023		2,276		(14,202	)		440,097
Held to maturity:
U.S. Government agency mortgage-backed securities		431		11		—			442
Other securities		250		—		—			250
Total held to maturity		681		11		—			692
Total investment securities	$	452,704	$	2,287	$	(14,202	)	$	440,789

Gross Unrealized Losses by Investment Category

The following table provides the gross unrealized losses and fair value, aggregated by investment category and length of time the individual securities have been in a continuous unrealized loss position at December 31, 2014 and 2013:

GROSS UNREALIZED LOSSES BY INVESTMENT CATEGORY

	Less than 12 Months					12 Months or Longer					Total
	Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses
December 31, 2014
U.S. Government agency securities	$	—	$	—		$	4,786	$	(187	)	$	4,786	$	(187	)
U.S. Government agency mortgage-backed securities		7,801		(35	)		33,453		(1,016	)		41,254		(1,051	)
Trust preferred securities		—		—			9,410		(2,604	)		9,410		(2,604	)
Collateralized Loan Obligations		23,710		(256	)		44,894		(1,072	)		68,604		(1,328	)
Total	$	31,511	$	(291	)	$	92,543	$	(4,879	)	$	124,054	$	(5,170	)
December 31, 2013
U.S. Government agency securities	$	—	$	—		$	4,407	$	(562	)	$	4,407	$	(562	)
U.S. Government agency mortgage-backed securities		246,348		(7,374	)		7,961		(921	)		254,309		(8,295	)
Other mortgage-backed securities		—		—			—		—			—		—
Trust preferred securities		—		—			7,967		(4,659	)		7,967		(4,659	)
Collateralized Loan Obligations		45,729		(686	)		—		—			45,729		(686	)
Total	$	292,077	$	(8,060	)	$	20,335	$	(6,142	)	$	312,412	$	(14,202	)

Contractual Maturities of Investment Securities

The amortized cost and estimated fair value of the investment securities, by contractual maturity, at December 31, 2014 is shown below. Actual maturities will differ from contractual maturities as borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

CONTRACTUAL MATURITIES OF INVESTMENT SECURITIES

	Available for Sale				Held to Maturity
December 31, 2014	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due in one year or less	$	15,106	$	15,109	$	—	$	—
Due after one year through five years		1,181		1,240		250		250
Due after five years through ten years		25,347		25,707		—		—
Due after ten years		89,619		87,023		—		—
Total investment securities, excluding mortgage- backed securities		131,253		129,079		250		250
U.S. Government agency mortgage-backed securities		263,215		265,156		239		251
Other mortgage-backed securities		265		265		—		—
Total investment securities	$	394,733	$	394,500	$	489	$	501