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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available For Sale, Held-to-Maturity, and Restricted Equity Securities The following table summarizes the amortized cost and estimated fair value of investment securities at March 31, 2019:
 
Amortized
Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value (Estimated)
Securities available for sale
 
 
 
 
 
 
 
U.S. Government-sponsored agencies
$
5,000,000

 
$
16,000

 
$
—

 
$
5,016,000

Mortgage-backed securities
317,269,000

 
1,394,000

 
(3,240,000
)
 
315,423,000

State and political subdivisions
4,955,000

 
4,000

 
(122,000
)
 
4,837,000

 
$
327,224,000

 
$
1,414,000

 
$
(3,362,000
)
 
$
325,276,000

Securities to be held to maturity
 
 
 
 
 
 
 
U.S. Government-sponsored agencies
$
31,155,000

 
$
48,000

 
$
(280,000
)
 
$
30,923,000

Mortgage-backed securities
17,560,000

 
372,000

 
(146,000
)
 
17,786,000

State and political subdivisions
225,204,000

 
3,162,000

 
(1,801,000
)
 
226,565,000

Corporate securities
7,300,000

 
—

 
(6,000
)
 
7,294,000

 
$
281,219,000

 
$
3,582,000

 
$
(2,233,000
)
 
$
282,568,000

Restricted equity securities
 
 
 
 
 
 
 
Federal Home Loan Bank Stock
$
7,945,000

 
$
—

 
$
—

 
$
7,945,000

Federal Reserve Bank Stock
1,037,000

 
—

 
—

 
1,037,000

 
$
8,982,000

 
$
—

 
$
—

 
$
8,982,000


The following table summarizes the amortized cost and estimated fair value of investment securities at December 31, 2018:
 
Amortized
Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value (Estimated)
Securities available for sale
 
 
 
 
 
 
 
U.S. Government-sponsored agencies

$
5,000,000

 
$
7,000

 
$
—

 
$
5,007,000

Mortgage-backed securities
313,854,000

 
571,000

 
(6,732,000
)
 
307,693,000

State and political subdivisions
4,955,000

 
—

 
(239,000
)
 
4,716,000

 
$
323,809,000

 
$
578,000

 
$
(6,971,000
)
 
$
317,416,000

Securities to be held to maturity
 
 
 
 
 
 
 
U.S. Government-sponsored agencies
$
11,155,000

 
$
—

 
$
(472,000
)
 
$
10,683,000

Mortgage-backed securities
18,250,000

 
336,000

 
(255,000
)
 
18,331,000

State and political subdivisions
221,958,000

 
1,046,000

 
(5,418,000
)
 
217,586,000

Corporate securities
4,300,000

 
—

 
—

 
4,300,000

 
$
255,663,000

 
$
1,382,000

 
$
(6,145,000
)
 
$
250,900,000

Restricted equity securities
 
 
 
 
 
 
 
Federal Home Loan Bank Stock
$
10,549,000

 
$
—

 
$
—

 
$
10,549,000

Federal Reserve Bank Stock
1,037,000

 
—

 
—

 
1,037,000

 
$
11,586,000

 
$
—

 
$
—

 
$
11,586,000


The following table summarizes the amortized cost and estimated fair value of investment securities at March 31, 2018:
 
Amortized
Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value (Estimated)
Securities available for sale
 
 
 
 
 
 
 
Mortgage-backed securities
$
302,935,000

 
$
191,000

 
$
(7,798,000
)
 
$
295,328,000

State and political subdivisions
5,765,000

 
3,000

 
(257,000
)
 
5,511,000

 
$
308,700,000

 
$
194,000

 
$
(8,055,000
)
 
$
300,839,000

Securities to be held to maturity
 
 
 
 
 
 
 
U.S. Government-sponsored agencies
$
11,155,000

 
$
—

 
$
(515,000
)
 
$
10,640,000

Mortgage-backed securities
21,990,000

 
469,000

 
(289,000
)
 
22,170,000

State and political subdivisions
221,245,000

 
1,497,000

 
(4,001,000
)
 
218,741,000

Corporate securities
4,300,000

 
—

 
—

 
4,300,000

 
$
258,690,000

 
$
1,966,000

 
$
(4,805,000
)
 
$
255,851,000

Restricted equity securities
 
 
 
 
 
 
 
Federal Home Loan Bank Stock
$
10,910,000

 
$
—

 
$
—

 
$
10,910,000

Federal Reserve Bank Stock
1,037,000

 
—

 
—

 
1,037,000

 
$
11,947,000

 
$
—

 
$
—

 
$
11,947,000
Contractual Maturities of Investment Securities The following table summarizes the contractual maturities of investment securities at March 31, 2019:
 
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
$
—

 
$
—

 
$
1,429,000

 
$
1,431,000

Due in 1 to 5 years
15,670,000

 
15,736,000

 
21,096,000

 
21,203,000

Due in 5 to 10 years
107,978,000

 
108,698,000

 
176,967,000

 
178,044,000

Due after 10 years
203,576,000

 
200,842,000

 
81,727,000

 
81,890,000

 
$
327,224,000

 
$
325,276,000

 
$
281,219,000

 
$
282,568,000


The following table summarizes the contractual maturities of investment securities at December 31, 2018:
 
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
$
—

 
$
—

 
$
1,432,000

 
$
1,433,000

Due in 1 to 5 years
13,501,000

 
13,518,000

 
20,717,000

 
20,778,000

Due in 5 to 10 years
83,954,000

 
83,326,000

 
157,544,000

 
155,313,000

Due after 10 years
226,354,000

 
220,572,000

 
75,970,000

 
73,376,000

 
$
323,809,000

 
$
317,416,000

 
$
255,663,000

 
$
250,900,000


The following table summarizes the contractual maturities of investment securities at March 31, 2018:
 
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
$
61,000

 
$
61,000

 
$
634,000

 
$
635,000

Due in 1 to 5 years
6,502,000

 
6,492,000

 
25,692,000

 
25,796,000

Due in 5 to 10 years
66,434,000

 
65,234,000

 
145,297,000

 
144,211,000

Due after 10 years
235,703,000

 
229,052,000

 
87,067,000

 
85,209,000

 
$
308,700,000

 
$
300,839,000

 
$
258,690,000

 
$
255,851,000
Schedule of Securities Gains and Losses The following table shows securities gains and losses for the three months ended March 31, 2019 and 2018:
 
For the three months ended March 31,
 
 
2019
 
2018
 
Proceeds from sales of securities
$
—

 
$
459,000

 
Gross realized gains
—

 
136,000

 
Gross realized losses
—

 
—

 
Net gain
$
—

 
$
136,000

 
Related income taxes
$
—

 
$
29,000

 
Schedule of Securities Temporarily Impaired Information regarding securities temporarily impaired as of March 31, 2019 is summarized below:
 
Less than 12 months
 
12 months or more
 
Total
 
Fair Value (Estimated)
 
Unrealized Losses
 
Fair Value (Estimated)
 
Unrealized Losses
 
Fair Value (Estimated)
 
Unrealized Losses
U.S. Government-sponsored agencies
$
—

 
$
—

 
$
10,875,000

 
$
(280,000
)
 
$
10,875,000

 
$
(280,000
)
Mortgage-backed securities
24,525,000

 
(138,000
)
 
198,272,000

 
(3,248,000
)
 
222,797,000

 
(3,386,000
)
State and political subdivisions
1,264,000

 
(3,000
)
 
58,168,000

 
(1,920,000
)
 
59,432,000

 
(1,923,000
)
Corporate securities
2,994,000

 
(6,000
)
 
—

 
—

 
2,994,000

 
(6,000
)
 
$
28,783,000

 
$
(147,000
)
 
$
267,315,000

 
$
(5,448,000
)
 
$
296,098,000

 
$
(5,595,000
)

As of December 31, 2018, there were 511 securities with unrealized losses held in the Company's portfolio. These securities were temporarily impaired as a result of changes in interest rates reducing their fair value, of which 232 had been temporarily impaired for 12 months or more. Information regarding securities temporarily impaired as of December 31, 2018 is summarized below:
 
Less than 12 months
 
12 months or more
 
Total
 
Fair Value (Estimated)
 
Unrealized Losses
 
Fair Value (Estimated)
 
Unrealized Losses
 
Fair Value (Estimated)
 
Unrealized Losses
U.S. Government-sponsored agencies
$
—

 
$
—

 
$
10,683,000

 
$
(472,000
)
 
$
10,683,000

 
$
(472,000
)
Mortgage-backed securities
76,050,000

 
(1,061,000
)
 
185,136,000

 
(5,926,000
)
 
261,186,000

 
(6,987,000
)
State and political subdivisions
76,809,000

 
(1,784,000
)
 
45,052,000

 
(3,873,000
)
 
121,861,000

 
(5,657,000
)
 
$
152,859,000

 
$
(2,845,000
)
 
$
240,871,000

 
$
(10,271,000
)
 
$
393,730,000

 
$
(13,116,000
)

As of March 31, 2018, there were 457 securities with unrealized losses held in the Company's portfolio. These securities were temporarily impaired as a result of changes in interest rates reducing their fair value, of which 159 had been temporarily impaired for 12 months or more. Information regarding securities temporarily impaired as of March 31, 2018 is summarized below:
 
Less than 12 months
 
12 months or more
 
Total
 
Fair Value (Estimated)
 
Unrealized Losses
 
Fair Value (Estimated)
 
Unrealized Losses
 
Fair Value (Estimated)
 
Unrealized Losses
U.S. Government-sponsored agencies
$
6,946,000

 
$
(309,000
)
 
$
3,694,000

 
$
(206,000
)
 
$
10,640,000

 
$
(515,000
)
Mortgage-backed securities
183,335,000

 
(4,332,000
)
 
101,012,000

 
(3,755,000
)
 
284,347,000

 
(8,087,000
)
State and political subdivisions
64,594,000

 
(1,533,000
)
 
37,182,000

 
(2,725,000
)
 
101,776,000

 
(4,258,000
)
 
$
254,875,000

 
$
(6,174,000
)
 
$
141,888,000

 
$
(6,686,000
)
 
$
396,763,000

 
$
(12,860,000
)