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Investments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 301,445 $ 301,739
Gross unrealized gains 3,427 3,193
Gross unrealized losses (2,980) (4,686)
Estimated fair value 301,892 300,246
US Treasury Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 500 500
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Estimated fair value 500 500
Agency Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 19,209 20,167
Gross unrealized gains 10 10
Gross unrealized losses (451) (534)
Estimated fair value 18,768 19,643
Nontaxable Municipal Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 90,726 90,700
Gross unrealized gains 1,813 1,712
Gross unrealized losses (330) (619)
Estimated fair value 92,209 91,793
Taxable Municipal Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 53,746 53,244
Gross unrealized gains 384 270
Gross unrealized losses (535) (1,042)
Estimated fair value 53,595 52,472
Collateralized Mortgage Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 128,239 127,384
Gross unrealized gains 723 700
Gross unrealized losses (1,664) (2,491)
Estimated fair value 127,298 125,593
Certificates of Deposit [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 8,423 9,142
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Estimated fair value 8,423 9,142
Common Stock [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 602 602
Gross unrealized gains 497 501
Gross unrealized losses 0 0
Estimated fair value $ 1,099 $ 1,103