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Impairment of Investment Securities (Tables)
 6 Months Ended
Jun. 30, 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, 2017 by investment category and time frame for which 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
$
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
)
Obligation 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
)
The following table presents the gross unrealized losses and estimated fair values at June 30, 2018 for both available for sale and held to maturity securities by investment category and time frame for which 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
$
7,106

 
$
(231
)
 
$
—

 
$
—

 
$
7,106

 
$
(231
)
Mortgage-Backed Securities – Commercial
71,408

 
(1,747
)
 
54,482

 
(2,509
)
 
125,890

 
(4,256
)
Obligations of U.S. Government-Sponsored Enterprises:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-Backed Securities – Residential
523,619

 
(13,093
)
 
360,389

 
(17,432
)
 
884,008

 
(30,525
)
Mortgage-Backed Securities – Commercial
13,290

 
(369
)
 
—

 
—

 
13,290

 
(369
)
Other Government-Sponsored Enterprises
—

 
—

 
100

 
—

 
100

 
—

Obligations of States and Political Subdivisions
31,005

 
(413
)
 
3,499

 
(281
)
 
34,504

 
(694
)
Debt securities issued by foreign governments
391

 
(9
)
 
—

 
—

 
391

 
(9
)
Corporate Securities
18,669

 
(310
)
 
—

 
—

 
18,669

 
(310
)
Total Securities
$
665,488

 
$
(16,172
)
 
$
418,470

 
$
(20,222
)
 
$
1,083,958

 
$
(36,394
)

    
Pooled Trust Preferred Collateralized Debt Obligations
.
Cumulative Roll Forward of Credit Losses Recognized in Earnings for Debt Securities held and not Intended to be Sold
The following table provides a cumulative roll forward of credit losses recognized in earnings for the trust preferred securities:
 
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
 
(dollars in thousands)
Balance, beginning (a)
$
9,759

 
$
16,828

 
$
12,208

 
$
17,056

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 security (b)
(76
)
 
(218
)
 
(223
)
 
(446
)
Reduction for debt securities sold during the period
(9,164
)
 
—

 
(9,164
)
 
—

Reduction for debt securities called during the period
(519
)
 
—

 
(2,821
)
 
—

Balance, ending
$
—

 
$
16,610

 
$
—

 
$
16,610

 
(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 in interest income during the period.