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Securities (Tables)
 9 Months Ended
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Amortized cost and fair value of investments classified as available-for-sale
 
 
September 30, 2018
(Dollar amounts in thousands)
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value
U.S. Government agencies
 
$
13,042

 
$
2

 
$
(571
)
 
$
12,473

Mortgage Backed Securities - residential
 
189,999

 
798

 
(6,146
)
 
184,651

Collateralized mortgage obligations
 
368,486

 
26

 
(13,965
)
 
354,547

State and municipal obligations
 
231,565

 
1,764

 
(2,730
)
 
230,599

Collateralized debt obligations
 
179

 
3,244

 
—

 
3,423

TOTAL
 
$
803,271

 
$
5,834

 
$
(23,412
)
 
$
785,693

 
 
December 31, 2017
(Dollar amounts in thousands)
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value
U.S. Government agencies
 
$
13,989

 
$
24

 
$
(318
)
 
$
13,695

Mortgage Backed Securities-residential
 
215,079

 
2,071

 
(1,812
)
 
215,338

Mortgage Backed Securities-commercial
 
1

 
—

 
—

 
1

Collateralized mortgage obligations
 
346,005

 
370

 
(6,705
)
 
339,670

State and municipal obligations
 
227,651

 
4,671

 
(700
)
 
231,622

Collateralized debt obligations
 
8,644

 
5,961

 
—

 
14,605

TOTAL
 
$
811,369

 
$
13,097

 
$
(9,535
)
 
$
814,931
Schedule of contractual maturities of debt securities
Contractual maturities of debt securities at September 30, 2018 were as follows. Securities not due at a single maturity or with no maturity date, primarily mortgage-backed and equity securities are shown separately.
 
 
Available-for-Sale
 
 
Amortized
 
Fair
(Dollar amounts in thousands)
 
Cost
 
Value
Due in one year or less
 
$
3,965

 
$
3,961

Due after one but within five years
 
32,844

 
33,151

Due after five but within ten years
 
74,009

 
74,647

Due after ten years
 
133,968

 
134,736

 
 
244,786

 
246,495

Mortgage-backed securities and collateralized mortgage obligations
 
558,485

 
539,198

TOTAL
 
$
803,271

 
$
785,693
Schedule of gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in continuous unrealized loss position
The following tables show the securities’ gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in continuous unrealized loss position, at September 30, 2018 and December 31, 2017. 
 
 
September 30, 2018
 
 
Less Than 12 Months
 
More Than 12 Months
 
Total
 
 
 
 
Unrealized
 
 
 
Unrealized
 
 
 
Unrealized
(Dollar amounts in thousands)
 
Fair Value
 
Losses
 
Fair Value
 
Losses
 
Fair Value
 
Losses
U.S. Government agencies
 
$
—

 
$
—

 
$
11,782

 
$
(571
)
 
$
11,782

 
$
(571
)
Mortgage Backed Securities - Residential
 
$
104,404

 
$
(3,323
)
 
$
52,106

 
$
(2,823
)
 
$
156,510

 
$
(6,146
)
Collateralized mortgage obligations
 
191,204

 
(4,317
)
 
158,396

 
(9,648
)
 
349,600

 
(13,965
)
State and municipal obligations
 
96,736

 
(1,627
)
 
21,574

 
(1,103
)
 
118,310

 
(2,730
)
Total temporarily impaired securities
 
$
392,344

 
$
(9,267
)
 
$
243,858

 
$
(14,145
)
 
$
636,202

 
$
(23,412
)
 
 
 
December 31, 2017
 
 
Less Than 12 Months
 
More Than 12 Months
 
Total
 
 
 
 
Unrealized
 
 
 
Unrealized
 
 
 
Unrealized
(Dollar amounts in thousands)
 
Fair Value
 
Losses
 
Fair Value
 
Losses
 
Fair Value
 
Losses
US Government entity mortgage-backed securities
 
$
9,321

 
$
(86
)
 
$
3,538

 
$
(232
)
 
$
12,859

 
$
(318
)
Mortgage Backed Securities - Residential
 
$
79,918

 
$
(425
)
 
$
53,815

 
$
(1,387
)
 
$
133,733

 
$
(1,812
)
Collateralized mortgage obligations
 
150,182

 
(1,418
)
 
146,750

 
(5,287
)
 
296,932

 
(6,705
)
State and municipal obligations
 
27,347

 
(183
)
 
18,660

 
(517
)
 
46,007

 
(700
)
Total temporarily impaired securities
 
$
266,768

 
$
(2,112
)
 
$
222,763

 
$
(7,423
)
 
$
489,531

 
$
(9,535
)
Rollforward of the credit losses recognized in earnings
The table below presents a rollforward of the credit losses recognized in earnings for the three and nine month periods ended September 30, 2018 and 2017:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(Dollar amounts in thousands)
 
2018
 
2017
 
2018
 
2017
Beginning balance
 
$
2,974

 
$
7,132

 
$
7,132

 
$
13,974

Increases to the amount related to the credit
 
 

 
 

 
 

 
 

Loss for which other-than-temporary was previously recognized
 
—

 
—

 
—

 
—

Reductions for increases in cash flows collected
 
—

 
—

 


 
—

Reductions for securities called during the period
 
—

 
—

 
(4,158
)
 
(6,842
)
Ending balance
 
$
2,974

 
$
7,132

 
$
2,974

 
$
7,132