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Impairment of Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2018
Impairment of Investment Securities Disclosure [Abstract]  
Schedule of Unrealized Losses and Estimated Fair Values
The following table presents the gross unrealized losses and estimated fair values at December 31, 2018 for both available for sale and held to maturity securities by investment category and time frame for which the securities have been in a continuous unrealized loss position:
 
Less Than 12 Months
 
12 Months or More
 
Total
 
Estimated
Fair Value
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
 
Gross
Unrealized
Losses
 
(dollars in thousands)
Obligations of U.S. Government Agencies:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-Backed Securities – Residential
$
2,289

 
$
(41
)
 
$
5,028

 
$
(140
)
 
$
7,317

 
$
(181
)
Mortgage-Backed Securities – Commercial
95,826

 
(925
)
 
75,959

 
(3,505
)
 
171,785

 
(4,430
)
Obligations of U.S. Government-Sponsored Enterprises:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-Backed Securities – Residential
156,732

 
(1,856
)
 
626,003

 
(20,789
)
 
782,735

 
(22,645
)
Mortgage-Backed Securities – Commercial
—

 
—

 
12,901

 
(258
)
 
12,901

 
(258
)
Obligations of States and Political Subdivisions
8,591

 
(85
)
 
9,338

 
(234
)
 
17,929

 
(319
)
Corporate Securities
14,769

 
(214
)
 
3,993

 
(7
)
 
18,762

 
(221
)
Total Securities
$
278,207

 
$
(3,121
)
 
$
733,222

 
$
(24,933
)
 
$
1,011,429

 
$
(28,054
)
 
At December 31, 2018, fixed income securities issued by U.S. Government-sponsored enterprises comprised 82% of total unrealized losses due to changes in market interest rates. Government agencies account for 16% of total unrealized losses as a result of changes in market interest rates. At December 31, 2018, there were 132 debt securities in an unrealized loss position, 59 of which related to residential mortgage-backed securities with an unrealized loss of 12 months or more. There were no equity securities in an unrealized loss position at December 31, 2018.

The following table presents the gross unrealized losses and estimated fair value at December 31, 2017 for both available for sale and held to maturity securities by investment category and time frame for which the securities had been in a continuous unrealized loss position: 
 
Less Than 12 Months
 
12 Months or More
 
Total
 
Estimated
Fair Value
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
 
Gross
Unrealized
Losses
 
(dollars in thousands)
Obligations of U.S. Government Agencies:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-Backed Securities – Residential
$
5,584

 
$
(21
)
 
$
—

 
$
—


$
5,584

 
$
(21
)
Mortgage-Backed Securities – Commercial
48,322

 
(962
)
 
32,683

 
(894
)
 
81,005

 
(1,856
)
Obligations of U.S. Government-Sponsored Enterprises:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-Backed Securities – Residential
351,222

 
(2,295
)
 
400,984

 
(9,746
)

752,206

 
(12,041
)
Mortgage-Backed Securities – Commercial
13,985

 
(71
)
 
—

 
—

  
13,985

 
(71
)
Other Government-Sponsored Enterprises
997

 
(1
)
 
99

 
—

  
1,096

 
(1
)
Obligations of States and Political Subdivisions
7,144

 
(32
)
 
3,653

 
(129
)
 
10,797

 
(161
)
Corporate Securities
3,993

 
(4
)
 
—

 
—

  
3,993

 
(4
)
Pooled Trust Preferred Collateralized Debt Obligations
—

 
—

 
19,120

 
(4,379
)
 
19,120

 
(4,379
)
Total Securities
$
431,247

 
$
(3,386
)
 
$
456,539

 
$
(15,148
)
 
$
887,786

 
$
(18,534
)
Cumulative Roll Forward of Credit Losses Recognized in Earnings for Debt Securities Held and Not Intended to be Sold
 
2018
 
2017
 
2016
 
(dollars in thousands)
Balance, beginning (a)
$
12,208

 
$
17,056

 
$
24,851

Credit losses on debt securities for which other-than-temporary impairment was not previously recognized
—

 
—

 
—

Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized
—

 
—

 
—

Increases in cash flows expected to be collected, recognized over the remaining life of the securities (b)
(223
)
 
(890
)
 
(1,124
)
Reduction for debt securities sold during the period
(9,164
)
 
—

 
—

Reduction for debt securities called during the period
(2,821
)
 
(3,958
)
 
(6,671
)
Balance, ending
$
—

 
$
12,208

 
$
17,056

(a)
The beginning balance represents credit related losses included in other-than-temporary impairment charges recognized on debt securities in prior periods.
(b)
Represents the increase in cash flows recognized either as principal payments or interest income during the period.