Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investment securities available for sale, cost	$ 130,308	$ 150,905
Investment securities held to maturity, fair value	363,178	345,576
Allowance for loan losses	33,293	40,686
Intangible assets, amortization	7,104	6,504
Premises and equipment, depreciation	38,269	39,504
Other real estate owned assets, allowance	8,666	8,666
Discount and debt issuance costs	$ 889	$ 969
Preferred, par value	$ 0.01	$ 0.01
Preferred, shares authorized	2,000,000	2,000,000
Preferred, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	41,555,208	41,122,119
Common stock, shares outstanding	41,555,208	41,122,119
Accumulated other comprehensive income, tax	$ 348	$ 2,013