Deposit Accounts (Tables)

12 Months Ended

Dec. 31, 2016

Deposits [Abstract]

Schedule of components of deposit accounts and weighted average interest rates

Deposit accounts and weighted average interest rates consisted of the following at December 31:

	2016		Weighted Average Interest Rate		2015		Weighted Average Interest Rate
	(dollars in thousands)
Transaction accounts
Noninterest-bearing checking	$	1,185,672	—	%	$	711,771	—	%
Interest-bearing checking	182,893		0.11	%	134,999		0.11	%
Money market	1,100,787		0.34	%	743,871		0.35	%
Savings	101,574		0.14	%	83,507		0.15	%
Total transaction accounts	2,570,926		0.16	%	1,674,148		0.17	%
Certificates of deposit accounts
Less than 100,000	121,148		0.74	%	126,704		0.79	%
$100,000 through $250,000	153,103		0.82	%	166,397		0.91	%
Greater than $250,000	300,308		0.74	%	227,874		0.72	%
Total certificates of deposit accounts	574,559		0.76	%	520,975		0.80	%
Total deposits	$	3,145,485	0.27	%	$	2,195,123	0.32	%

Schedule of aggregate annual maturities of certificates of deposit accounts

The aggregate annual maturities of certificates of deposit accounts at December 31, 2016 are as follows:

	2016
	Balance		Weighted Average Interest Rate
	(dollars in thousands)
Within 3 months	$	147,508	0.66	%
4 to 6 months	137,620		0.74	%
7 to 12 months	191,814		0.77	%
13 to 24 months	87,050		0.92	%
25 to 36 months	6,533		0.87	%
37 to 60 months	3,370		1.29	%
Over 60 months	664		0.90	%
Total	$	574,559	0.76	%

Schedule of interest expense on deposit accounts

Interest expense on deposit accounts for the years ended December 31 is summarized as follows:

	2016		2015		2014
	(dollars in thousands)
Checking accounts	$	200	$	165	$	161
Money market accounts	3,641		2,426		1,443
Savings	151		141		110
Certificates of deposit accounts	4,399		3,898		3,323
Total	$	8,391	$	6,630	$	5,037