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Investment Securities Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost $ 182,853 $ 150,791 $ 169,277
Unrealized Gains 3,724 6,273 3,264
Unrealized Losses (10,015) (512) (14,205)
Fair Value (Estimated) 176,562 156,552 158,336
US Treasury and Government [Member]
      
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 92,312 60,940 92,280
Unrealized Gains 2 79 1
Unrealized Losses (9,131) (289) (12,757)
Fair Value (Estimated) 83,183 60,730 79,524
Collateralized Mortgage Backed Securities [Member]
      
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 49,805 46,604 35,712
Unrealized Gains 1,652 2,634 1,440
Unrealized Losses (789) (218) (1,336)
Fair Value (Estimated) 50,668 49,020 35,816
US States and Political Subdivisions Debt Securities [Member]
      
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 40,436 42,947 40,985
Unrealized Gains 2,070 3,560 1,823
Unrealized Losses (95) (5) (112)
Fair Value (Estimated) 42,411 46,502 42,696
Corporate Debt Securities [Member]
      
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 300 300 300
Unrealized Gains 0 0 0
Unrealized Losses 0 0 0
Fair Value (Estimated) $ 300 $ 300 $ 300