Fair Value Disclosures - Narrative (Details) - USD ($)				3 Months Ended		12 Months Ended
	Jul. 01, 2014	Jan. 27, 2014	May. 01, 2013	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Goodwill, period increase				$ 0	$ 1,424,000
Valuation adjustments for loans held for sale				0		$ 0
Carrying value of impaired loans held for investment				46,474,000		48,933,000
Valuation allowance of impaired loans held for investment				341,000		322,000
Mortgage Servicing Rights Carrying Amount Before Valuation Allowance				5,800,000		5,900,000
Mortgage Servicing Rights Valuation Allowance				0		0
Fair Value Measured on Recurring Basis [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets measured at fair value on a recurring basis				294,146,000		330,859,000
Level 3 [Member] | Fair Value Measured on Recurring Basis [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets measured at fair value on a recurring basis				0		0
Sterner Insurance Associates Inc [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Potential cash payments from contingent consideration, minimum	$ 0
Potential cash payments from contingent consideration, maximum	$ 3,900,000.0
Potential cash payments from contingent consideration, period of measurement (in years)	2 years
Potential cash payments from contingent consideration, end date	Jun. 30, 2017
Goodwill, period increase				0	1,424,000
Girard Partners [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Potential cash payments from contingent consideration, minimum		$ 0
Potential cash payments from contingent consideration, maximum		$ 12,900,000.0
Potential cash payments from contingent consideration, end date		Dec. 31, 2018
Reduction Of Other Noninterest Expense						$ 550,000
Goodwill, period increase				0	0
Remaining potential cash payments from contingent consideration, period of measurement (in years)		3 years
John T. Fretz Insurance Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Potential cash payments from contingent consideration, minimum			$ 0
Potential cash payments from contingent consideration, maximum			$ 360,000
Potential cash payments from contingent consideration, end date			Apr. 30, 2016
Goodwill, period increase				0	$ 0
Remaining potential cash payments from contingent consideration, period of measurement (in years)			1 year
Held for Investment [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value of impaired loans held for investment				$ 46,500,000