Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Investment securities available for sale [Abstract]
U.S. Treasury Securities	$ 0
U.S. government agency securities	96,447		$ 128,193
Mortgage-backed securities	771,950		582,916
State and municipal securities	169,077		165,042
Agency- backed securities	67,344		48,801
Corporate notes and other	4,403		10,113
Total investment securities available-for-sale	1,109,221		935,065
Other investments	10,381		9,764
Other assets	36,893		15,147
Total assets at fair value	1,156,495		959,976
Liabilities at fair value [Abstract]
Other liabilities	38,983		16,568
Total liabilities at fair value	38,983		16,568
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Other real estate owned	5,006		5,083
Nonperforming loans, net	26,752		18,958
Total	31,758		24,041
Gain (losses) on Other real estate owned	(219)		(41)
Gain (losses) on Impaired loans, net	(2,804)		(2,637)
Total gains (losses)	(3,023)		(2,678)
Other Liabilities [Member]
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]
Fair value, January 1	0	$ 0	0
Total net realized (losses) gains included in income	0	0
Change in unrealized gains/losses included in other comprehensive income for assets and liabilities still held at March 31	0	0
Purchases	0	0
Issuances	0	0
Settlements	0	0
Transfers out of Level 3	0	0
Fair value, June 30	0	0	0
Total net realized (losses) gains included in income related to financial assets and liabilities still on the consolidated balance sheet at March 31	0	0
Quoted Market Prices in an Active Market (Level 1) [Member]
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Other real estate owned	0		0
Nonperforming loans, net	0		0
Total	0		0
Models with Significant Observable Market Parameters (Level 2) [Member]
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Other real estate owned	0		0
Nonperforming loans, net	0		0
Total	0		0
Models with Significant Unobservable Market Parameters (Level 3) [Member]
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Other real estate owned	5,006		5,083
Nonperforming loans, net	26,752		18,958
Total	31,758		24,041
Recurring [Member] | Quoted Market Prices in an Active Market (Level 1) [Member]
Investment securities available for sale [Abstract]
U.S. Treasury Securities	0
U.S. government agency securities	0		0
Mortgage-backed securities	0		0
State and municipal securities	0		0
Agency- backed securities	0		0
Corporate notes and other	0		0
Total investment securities available-for-sale	0		0
Other investments	0		0
Other assets	0		0
Total assets at fair value	0		0
Liabilities at fair value [Abstract]
Other liabilities	0		0
Total liabilities at fair value	0		0
Recurring [Member] | Models with Significant Observable Market Parameters (Level 2) [Member]
Investment securities available for sale [Abstract]
U.S. Treasury Securities	0
U.S. government agency securities	96,447		128,193
Mortgage-backed securities	771,950		582,916
State and municipal securities	169,077		165,042
Agency- backed securities	67,344		48,801
Corporate notes and other	4,403		10,113
Total investment securities available-for-sale	1,109,221		935,065
Other investments	0		0
Other assets	36,893		15,147
Total assets at fair value	1,146,114		950,212
Liabilities at fair value [Abstract]
Other liabilities	38,983		16,568
Total liabilities at fair value	38,983		16,568
Recurring [Member] | Models with Significant Unobservable Market Parameters (Level 3) [Member]
Investment securities available for sale [Abstract]
U.S. Treasury Securities	0
U.S. government agency securities	0		0
Mortgage-backed securities	0		0
State and municipal securities	0		0
Agency- backed securities	0		0
Corporate notes and other	0		0
Total investment securities available-for-sale	0		0
Other investments	10,381		9,764
Other assets	0		0
Total assets at fair value	10,381		9,764
Liabilities at fair value [Abstract]
Other liabilities	0		0
Total liabilities at fair value	0		0
Other Assets [Member]
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]
Fair value, January 1	9,764	8,004	8,004
Total net realized (losses) gains included in income	336	173
Change in unrealized gains/losses included in other comprehensive income for assets and liabilities still held at March 31	0	0
Purchases	571	548
Issuances	0	0
Settlements	(290)	(563)
Transfers out of Level 3	0	0
Fair value, June 30	10,381	8,162	$ 9,764
Total net realized (losses) gains included in income related to financial assets and liabilities still on the consolidated balance sheet at March 31	$ 336	$ 173