Investment Securities - Summary of Unrealized Losses of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities with losses under 12 months, Fair Value	$ 136,830	$ 29,437
Available-for-sale, Securities with losses under 12 months, Gross Unrealized Loss	1,107	158
Available-for-sale, Securities with losses over 12 months, Fair Value	40,140	68,536
Available-for-sale, Securities with losses over 12 months, Gross Unrealized Loss	1,356	1,917
Available-for-sale, Total, Fair Value	176,970	97,973
Available-for-sale, Total, Gross Unrealized Loss	2,463	2,075
Obligations of state and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities with losses under 12 months, Fair Value	4,365	2,029
Available-for-sale, Securities with losses under 12 months, Gross Unrealized Loss	95	29
Available-for-sale, Securities with losses over 12 months, Fair Value	0	0
Available-for-sale, Securities with losses over 12 months, Gross Unrealized Loss	0	0
Available-for-sale, Total, Fair Value	4,365	2,029
Available-for-sale, Total, Gross Unrealized Loss	95	29
GSE mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities with losses under 12 months, Fair Value	32,229	6,668
Available-for-sale, Securities with losses under 12 months, Gross Unrealized Loss	344	25
Available-for-sale, Securities with losses over 12 months, Fair Value	3,877	21,538
Available-for-sale, Securities with losses over 12 months, Gross Unrealized Loss	63	263
Available-for-sale, Total, Fair Value	36,106	28,206
Available-for-sale, Total, Gross Unrealized Loss	407	288
Collateralized mortgage obligations: residential
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities with losses under 12 months, Fair Value	96,995	9,366
Available-for-sale, Securities with losses under 12 months, Gross Unrealized Loss	663	53
Available-for-sale, Securities with losses over 12 months, Fair Value	33,105	37,997
Available-for-sale, Securities with losses over 12 months, Gross Unrealized Loss	1,229	1,467
Available-for-sale, Total, Fair Value	130,100	47,363
Available-for-sale, Total, Gross Unrealized Loss	1,892	1,520
Collateralized mortgage obligations: commercial
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities with losses under 12 months, Fair Value	1,141	0
Available-for-sale, Securities with losses under 12 months, Gross Unrealized Loss	1	0
Available-for-sale, Securities with losses over 12 months, Fair Value	3,158	3,747
Available-for-sale, Securities with losses over 12 months, Gross Unrealized Loss	64	107
Available-for-sale, Total, Fair Value	4,299	3,747
Available-for-sale, Total, Gross Unrealized Loss	65	107
Mutual funds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities with losses under 12 months, Fair Value	2,100
Available-for-sale, Securities with losses under 12 months, Gross Unrealized Loss	4
Available-for-sale, Securities with losses over 12 months, Fair Value	0
Available-for-sale, Securities with losses over 12 months, Gross Unrealized Loss	0
Available-for-sale, Total, Fair Value	2,100
Available-for-sale, Total, Gross Unrealized Loss	$ 4
U.S. Government sponsored enterprises
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities with losses under 12 months, Fair Value		4,973
Available-for-sale, Securities with losses under 12 months, Gross Unrealized Loss		32
Available-for-sale, Securities with losses over 12 months, Fair Value		5,254
Available-for-sale, Securities with losses over 12 months, Gross Unrealized Loss		80
Available-for-sale, Total, Fair Value		10,227
Available-for-sale, Total, Gross Unrealized Loss		112
Other asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities with losses under 12 months, Fair Value		6,401
Available-for-sale, Securities with losses under 12 months, Gross Unrealized Loss		19
Available-for-sale, Securities with losses over 12 months, Fair Value		0
Available-for-sale, Securities with losses over 12 months, Gross Unrealized Loss		0
Available-for-sale, Total, Fair Value		6,401
Available-for-sale, Total, Gross Unrealized Loss		$ 19