Parent Corporation Only Financial Statements (Details) - Condensed Statements of Condition - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
ASSETS
Cash and cash equivalents	$ 31,291	$ 31,813
Securities available-for-sale	195,770	289,532
Other assets	24,908	22,782
Total assets	4,016,721	3,448,572
LIABILITIES AND STOCKHOLDERS' EQUITY
Subordinated debentures	55,155	5,155
Stockholders' equity	477,344	446,219
Total liabilities and stockholders' equity	4,016,721	3,448,572
Parent Company [Member]
ASSETS
Cash and cash equivalents	14,857	274
Investment in subsidiaries	515,934	450,185
Securities available-for-sale	533	463
Other assets	3,070	2,250
Total assets	534,394	453,172
LIABILITIES AND STOCKHOLDERS' EQUITY
Other liabilities	1,895	1,798
Subordinated debentures	55,155	5,155
Stockholders' equity	477,344	446,219
Total liabilities and stockholders' equity	$ 534,394	$ 453,172