Fair Value (Details 4) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2011
Carrying amount and estimated fair value of financial instruments
Securities available-for-sale	$ 921,165	$ 914,560
Restricted stock	21,057	21,057
FDIC Indemnification Asset	754	1,055	1,055	2,632
Accrued interest receivable	11,451	11,554
Deposits	(2,507,014)	(2,458,791)
Level 1
Carrying amount and estimated fair value of financial instruments
Cash and due from banks	19,545	22,455
Federal funds sold	0	0
Securities available-for-sale	0	0
Loans, net	0	0
FDIC Indemnification Asset	0	0
Accrued interest receivable	0	0
Deposits	0	0
Short-term borrowings	0	0
Federal Home Loan Bank advances	0	0
Accrued interest payable	0	0
Level 2
Carrying amount and estimated fair value of financial instruments
Cash and due from banks	64,443	48,578
Federal funds sold	9,791	4,276
Securities available-for-sale	904,622	900,991
Loans, net		0
FDIC Indemnification Asset	754	1,055
Accrued interest receivable	3,617	3,279
Deposits	(2,507,882)	(2,460,197)
Short-term borrowings	(35,710)	(59,592)
Federal Home Loan Bank advances	(39,720)	(60,258)
Accrued interest payable	(646)	(750)
Level 3
Carrying amount and estimated fair value of financial instruments
Cash and due from banks	0	0
Federal funds sold	0	0
Securities available-for-sale	16,543	13,569
Loans, net	1,813,799	1,816,726
FDIC Indemnification Asset	0	0
Accrued interest receivable	7,834	8,275
Deposits	0	0
Short-term borrowings	0	0
Federal Home Loan Bank advances	0	0
Accrued interest payable	0	0
Carrying Value
Carrying amount and estimated fair value of financial instruments
Cash and due from banks	83,988	71,033
Federal funds sold	9,791	4,276
Securities available-for-sale	921,165	914,560
Restricted stock	21,057	21,057
Loans, net	1,763,566	1,771,360
FDIC Indemnification Asset	754	1,055
Accrued interest receivable	11,451	11,554
Deposits	(2,507,014)	(2,458,791)
Short-term borrowings	(35,710)	(59,592)
Federal Home Loan Bank advances	(38,214)	(58,288)
Accrued interest payable	(646)	(750)
Fair Value
Carrying amount and estimated fair value of financial instruments
Cash and due from banks	83,988	71,033
Federal funds sold	9,791	4,276
Securities available-for-sale	921,165	914,560
Loans, net	1,813,799	1,816,726
FDIC Indemnification Asset	754	1,055
Accrued interest receivable	11,451	11,554
Deposits	(2,507,882)	(2,460,197)
Short-term borrowings	(35,710)	(59,592)
Federal Home Loan Bank advances	(39,720)	(60,258)
Accrued interest payable	$ (646)	$ (750)