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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available For Sale, Held-to-Maturity, and Restricted Equity Securities
The following tables summarize the amortized cost and estimated fair value of investment securities at December 31, 2013 and 2012:
 
Amortized
 
Unrealized
 
Unrealized
 
Fair Value
As of December 31, 2013
Cost
 
Gains
 
Losses
 
(Estimated)
Securities available for sale
 
 
 
 
 
 
 
Mortgage-backed securities
$
180,109,000

 
$
1,392,000

 
$
(3,772,000
)
 
$
177,729,000

State and political subdivisions
134,188,000

 
1,458,000

 
(9,331,000
)
 
126,315,000

Other equity securities
1,666,000

 
116,000

 
(2,000
)
 
1,780,000

 
$
315,963,000

 
$
2,966,000

 
$
(13,105,000
)
 
$
305,824,000

Securities to be held to maturity
 
 
 
 
 
 
 
U.S. Government-sponsored agencies
$
92,280,000

 
$
1,000

 
$
(12,757,000
)
 
$
79,524,000

Mortgage-backed securities
35,712,000

 
1,440,000

 
(1,336,000
)
 
35,816,000

State and political subdivisions
40,985,000

 
1,823,000

 
(112,000
)
 
42,696,000

Corporate securities
300,000

 
—

 
—

 
300,000

 
$
169,277,000

 
$
3,264,000

 
$
(14,205,000
)
 
$
158,336,000

Restricted equity securities
 
 
 
 
 
 
 
Federal Home Loan Bank Stock
$
12,875,000

 
$
—

 
$
—

 
$
12,875,000

Federal Reserve Bank Stock
1,037,000

 
—

 
—

 
1,037,000

 
$
13,912,000

 
$
—

 
$
—

 
$
13,912,000


 
Amortized
 
Unrealized
 
Unrealized
 
Fair Value
As of December 31, 2012
Cost
 
Gains
 
Losses
 
(Estimated)
Securities available for sale
 
 
 
 
 
 
 
Mortgage-backed securities
$
164,752,000

 
$
4,636,000

 
$
(295,000
)
 
$
169,093,000

State and political subdivisions
113,069,000

 
8,074,000

 
(199,000
)
 
120,944,000

Other equity securities
1,578,000

 
43,000

 
(44,000
)
 
1,577,000

 
$
279,399,000

 
$
12,753,000

 
$
(538,000
)
 
$
291,614,000

Securities to be held to maturity
 
 
 
 
 
 
 
U.S. Government-sponsored agencies
$
60,919,000

 
$
242,000

 
$
(182,000
)
 
$
60,979,000

Mortgage-backed securities
39,193,000

 
2,850,000

 
(19,000
)
 
42,024,000

State and political subdivisions
42,908,000

 
4,036,000

 
—

 
46,944,000

Corporate securities
300,000

 
—

 
—

 
300,000

 
$
143,320,000

 
$
7,128,000

 
$
(201,000
)
 
$
150,247,000

Restricted equity securities
 
 
 
 
 
 
 
Federal Home Loan Bank Stock
$
13,412,000

 
$
—

 
$
—

 
$
13,412,000

Federal Reserve Bank Stock
1,036,000

 
—

 
—

 
1,036,000

 
$
14,448,000

 
$
—

 
$
—

 
$
14,448,000
Contractual Maturities of Investment Securities
The following table summarizes the contractual maturities of investment securities at December 31, 2013:

 
Securities available for sale
 
Securities to be held to maturity
 
Amortized Cost
 
Fair Value (Estimated)
 
Amortized Cost
 
Fair Value (Estimated)
Due in 1 year or less
$
717,000

 
$
721,000

 
$
268,000

 
$
273,000

Due in 1 to 5 years
20,547,000

 
20,636,000

 
6,420,000

 
6,790,000

Due in 5 to 10 years
16,114,000

 
16,267,000

 
33,442,000

 
33,828,000

Due after 10 years
276,919,000

 
266,420,000

 
129,147,000

 
117,445,000

Equity securities
1,666,000

 
1,780,000

 
—

 
—

 
$
315,963,000

 
$
305,824,000

 
$
169,277,000

 
$
158,336,000


The following table summarizes the contractual maturities of investment securities at December 31, 2012:

 
Securities available for sale
 
Securities to be held to maturity
In thousands of dollars
Amortized
 Cost
 
Fair Value (Estimated)
 
Amortized
 Cost
 
Fair Value (Estimated)
Due in 1 year or less
$
18,761,000

 
$
18,926,000

 
$
3,754,000

 
$
3,785,000

Due in 1 to 5 years
27,243,000

 
27,816,000

 
11,950,000

 
12,701,000

Due in 5 to 10 years
16,686,000

 
17,666,000

 
27,461,000

 
29,986,000

Due after 10 years
215,131,000

 
225,629,000

 
100,155,000

 
103,775,000

Equity securities
1,578,000

 
1,577,000

 
—

 
—

 
$
279,399,000

 
$
291,614,000

 
$
143,320,000

 
$
150,247,000
Schedule of Securities Gains and Losses
The following table shows securities gains and losses for 2013, 2012 and 2011:

 
2013
 
2012
 
2011
Proceeds from sales of securities
$
10,563,000

 
$
26,437,000

 
$
140,417,000

Gross realized gains
1,087,000

 
2,257,000

 
4,020,000

Gross realized losses
—

 
(289,000
)
 
(727,000
)
Net gain
$
1,087,000

 
$
1,968,000

 
$
3,293,000

Related income taxes
$
380,000

 
$
689,000

 
$
1,153,000
Schedule of Temporary Impairment Losses
Information regarding securities temporarily impaired as of December 31, 2013 is summarized below:

 
Less than 12 months
 
12 months or more
 
Total
 
Fair
 
Unrealized
 
Fair
 
Unrealized
 
Fair
 
Unrealized
As of December 31, 2013
Value
 
Losses
 
Value
 
Losses
 
Value
 
Losses
U.S. Government-sponsored agencies
$
78,724,000

 
$
(12,757,000
)
 
$
—

 
$
—

 
$
78,724,000

 
$
(12,757,000
)
Mortgage-backed securities
96,263,000

 
(4,977,000
)
 
5,451,000

 
(131,000
)
 
101,714,000

 
(5,108,000
)
State and political subdivisions
69,406,000

 
(7,895,000
)
 
7,150,000

 
(1,548,000
)
 
76,556,000

 
(9,443,000
)
Other equity securities
—

 
—

 
50,000

 
(2,000
)
 
50,000

 
(2,000
)
 
$
244,393,000

 
$
(25,629,000
)
 
$
12,651,000

 
$
(1,681,000
)
 
$
257,044,000

 
$
(27,310,000
)

Information regarding securities temporarily impaired as of December 31, 2012 is summarized below:

 
Less than 12 months
 
12 months or more
 
Total
 
Fair
 
Unrealized
 
Fair
 
Unrealized
 
Fair
 
Unrealized
As of December 31, 2012
Value
 
Losses
 
Value
 
Losses
 
Value
 
Losses
U.S. Government-sponsored agencies
$
15,817,000

 
$
(182,000
)
 
$
—

 
$
—

 
$
15,817,000

 
$
(182,000
)
Mortgage-backed securities
9,982,000

 
(231,000
)
 
2,534,000

 
(83,000
)
 
12,516,000

 
(314,000
)
State and political subdivisions
8,621,000

 
(199,000
)
 
—

 
—

 
8,621,000

 
(199,000
)
Other equity securities
—

 
—

 
222,000

 
(44,000
)
 
222,000

 
(44,000
)
 
$
34,420,000

 
$
(612,000
)
 
$
2,756,000

 
$
(127,000
)
 
$
37,176,000

 
$
(739,000
)