Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Investment securities available for sale [Abstract]
Alternative investments		$ 8,000	$ 8,000
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Valuation allowance of impaired loans		3,700	1,200
Other Liabilities [Member]
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]
Fair value, January 1		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 December 31		0	0
Purchases		0	0
Issuances		0	0
Settlements		0	0
Transfers out of Level 3		0	0
Fair value, December 31		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
Recurring [Member]
Investment securities available for sale [Abstract]
U.S. government agency securities		128,193	113,456
Mortgage-backed securities		582,916	455,839
State and municipal securities		165,042	138,578
Agency- backed securities		48,801	13,018
Corporate notes and other		10,113	11,164
Total investment securities available-for-sale		935,065	732,055
Alternative investments		9,764	8,004
Other assets		15,147	15,987
Total assets at fair value		959,976	756,046
Liabilities at fair value [Abstract]
Other liabilities		16,568	15,981
Total liabilities at fair value		16,568	15,981
Recurring [Member] | Quoted Market Prices in an Active Market (Level 1) [Member]
Investment securities available for sale [Abstract]
U.S. government agency securities		0	0
Mortgage-backed securities		0	0
State and municipal securities		0	0
Agency- backed securities			0
Corporate notes and other		0	0
Total investment securities available-for-sale		0	0
Alternative 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. government agency securities		128,193	113,456
Mortgage-backed securities		582,916	455,839
State and municipal securities		165,042	138,578
Agency- backed securities		48,801	13,018
Corporate notes and other		10,113	11,164
Total investment securities available-for-sale		935,065	732,055
Alternative investments		0	0
Other assets		15,147	15,987
Total assets at fair value		950,212	748,042
Liabilities at fair value [Abstract]
Other liabilities		16,568	15,981
Total liabilities at fair value		16,568	15,981
Recurring [Member] | Models with Significant Unobservable Market Parameters (Level 3) [Member]
Investment securities available for sale [Abstract]
U.S. government agency securities		0	0
Mortgage-backed securities		0	0
State and municipal securities		0	0
Agency- backed securities			0
Corporate notes and other		0	0
Total investment securities available-for-sale		0	0
Alternative investments		9,764	8,004
Other assets		0	0
Total assets at fair value		9,764	8,004
Liabilities at fair value [Abstract]
Other liabilities		0	0
Total liabilities at fair value		0	0
Nonrecurring [Member]
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Other real estate owned		5,083	11,186
Nonperforming loans, net	[1]	25,690	15,551
Total		30,773	26,737
Gain (losses) on Other real estate owned		(41)	(509)
Gain (losses) on Impaired loans, net	[1]	(2,637)	(1,032)
Total gains (losses)		(2,678)	(1,541)
Nonrecurring [Member] | 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	[1]	0	0
Total		0	0
Nonrecurring [Member] | 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	[1]	0	0
Total		0	0
Nonrecurring [Member] | 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		5,083	11,186
Nonperforming loans, net	[1]	25,690	15,551
Total		30,773	26,737
Other Assets [Member]
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]
Fair value, January 1		8,004	6,701
Total net realized (losses) gains included in income		149	670
Change in unrealized gains/losses included in other comprehensive income for assets and liabilities still held at December 31		0	0
Purchases		2,254	633
Issuances		0	0
Settlements		(643)	0
Transfers out of Level 3		0	0
Fair value, December 31		9,764	8,004
Total net realized (losses) gains included in income related to financial assets and liabilities still on the consolidated balance sheet at March 31		$ 149	$ 670

[1] Amount is net of a valuation allowance of $3.7 million and $1.2 million at December 31, 2015 and 2014, respectively, as required by ASC 310-10, "Receivables."