Business Segment Information - Net Interest Income and Noninterest Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Net interest income	$ 8,489	$ 7,629	$ 16,638	$ 15,547
Noninterest income	616	730	1,498	3,597
Assets	1,046,861		1,046,861		$ 1,099,610
Continuing Operations [Member]
Segment Reporting Information [Line Items]
Net interest income	8,489	7,626	16,638	15,470
Noninterest income	616	984	1,498	2,162
Assets	1,046,861		1,046,861		1,099,610
Continuing Operations [Member] | Commercial [Member]
Segment Reporting Information [Line Items]
Net interest income	8,562	7,698	16,805	15,539
Noninterest income	613	984	1,492	2,162
Assets	1,041,558		1,041,558		1,094,120
Continuing Operations [Member] | Other [Member]
Segment Reporting Information [Line Items]
Net interest income	(73)	(72)	(167)	(69)
Noninterest income	3	0	6	0
Assets	5,303		5,303		5,490
Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Net interest income	0	3	0	77
Noninterest income	0	$ (254)	0	$ 1,435
Assets	$ 0		$ 0		$ 0