Investment Securities (Tables)

3 Months Ended

Mar. 31, 2017

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 March 31, 2017 and December 31, 2016 were as follows:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
March 31, 2017
Available-for-sale:
U.S. Treasury securities	$	3,500	$	—	$	(3	)	$	3,497
U.S. Government agency mortgage-backed securities		254,895		459		(2,496	)		252,858
Trust preferred securities		12,024		—		(1,579	)		10,445
Collateralized loan obligations		31,474		8		(16	)		31,466
Other securities		1,261		—		(25	)		1,236
Total available-for-sale		303,154		467		(4,119	)		299,502
Held to maturity:
Other securities		250		—		—			250
Total held to maturity		250		—		—			250
Total investment securities	$	303,404	$	467	$	(4,119	)	$	299,752
December 31, 2016
Available-for-sale:
U.S. Treasury securities	$	2,498	$	—	$	—		$	2,498
U.S. Government agency mortgage-backed securities		246,650		583		(2,575	)		244,658
Trust preferred securities		12,023		—		(2,172	)		9,851
Collateralized loan obligations		37,471		8		(160	)		37,319
Other securities		1,386		—		(26	)		1,360
Total available-for-sale		300,028		591		(4,933	)		295,686
Held to maturity:
Other securities		250		—		—			250
Total held to maturity		250		—		—			250
Total investment securities	$	300,278	$	591	$	(4,933	)	$	295,936

Gross Unrealized Losses by Investment Category

The following table provides the gross unrealized losses and estimated fair value, aggregated by investment category and length of time the individual securities have been in a continuous unrealized loss position at March 31, 2017 and December 31, 2016:

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
March 31, 2017
U.S. Treasury securities	$	3,497	$	(3	)	$	—	$	—		$	3,497	$	(3	)
U.S. Government agency mortgage-backed securities		164,398		(2,061	)		11,196		(435	)		175,594		(2,496	)
Trust preferred securities		—		—			10,445		(1,579	)		10,445		(1,579	)
Collateralized loan obligations		21,986		(2	)		7,985		(14	)		29,971		(16	)
Other securities		975		(25	)		—		—			975		(25	)
Total	$	190,856	$	(2,091	)	$	29,626	$	(2,028	)	$	220,482	$	(4,119	)
December 31, 2016
U.S. Government agency mortgage-backed securities		108,070		(1,683	)		54,757		(892	)		162,827		(2,575	)
Trust preferred securities		—		—			9,851		(2,172	)		9,851		(2,172	)
Collateralized loan obligations		—		—			33,825		(160	)		33,825		(160	)
Other securities		975		(26	)		—		—			975		(26	)
Total	$	109,045	$	(1,709	)	$	98,433	$	(3,224	)	$	207,478	$	(4,933	)

Contractual Maturities of Investment Securities

The amortized cost and estimated fair value of the investment securities, by contractual maturity, at March 31, 2017 and December 31, 2016 are 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.

	Available for Sale				Held to Maturity
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
March 31, 2017
Due in one year or less	$	3,513	$	3,510	$	250	$	250
Due after one year through five years		248		248		—		—
Due after five years through ten years		31,474		31,466		—		—
Due after ten years		13,024		11,420		—		—
Total investment securities, excluding mortgage-    backed securities		48,259		46,644		250		250
U.S. Government agency mortgage-backed securities		254,895		252,858		—		—
Total investment securities	$	303,154	$	299,502	$	250	$	250
December 31, 2016
Due in one year or less	$	2,635	$	2,635	$	250	$	250
Due after one year through five years		248		248		—		—
Due after five years through ten years		37,471		37,319		—		—
Due after ten years		13,024		10,826		—		—
Total investment securities, excluding mortgage-    backed securities		53,378		51,028		250		250
U.S. Government agency mortgage-backed securities		246,650		244,658		—		—
Total investment securities	$	300,028	$	295,686	$	250	$	250