Condensed Consolidated Financial Statements (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Condensed Consolidated Financial Statements
Investment securities available for sale, cost	$ 172,321	$ 130,308
Investment securities held to maturity, fair value	360,380	363,178
Allowance for loan losses	36,850	33,293
Intangible assets, amortization	7,554	7,104
Premises and equipment, depreciation	36,768	38,269
Other real estate owned assets, allowance	8,666	8,666
Discount and debt issuance costs	$ 827	$ 889
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	41,799,566	41,555,208
Common stock, shares outstanding	41,799,566	41,555,208
Accumulated other comprehensive income, tax	$ 1,064	$ 348