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Securities (Tables)
 9 Months Ended
Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Amortized cost and fair value of investments classified as available-for-sale
 
 
September 30, 2019
(Dollar amounts in thousands)
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value
U.S. Government agencies
 
$
105,115

 
$
2,205

 
$
(44
)
 
$
107,276

Mortgage Backed Securities - residential
 
214,486

 
2,558

 
(308
)
 
216,736

Mortgage Backed Securities - commercial
 
24,193

 
231

 
—

 
24,424

Collateralized mortgage obligations
 
306,699

 
2,243

 
(904
)
 
308,038

State and municipal obligations
 
257,889

 
11,842

 
(75
)
 
269,656

Municpal taxable
 
731

 
1

 
—

 
732

U.S. Treasury
 
9,471

 
7

 
—

 
9,478

Collateralized debt obligations
 
7

 
3,597

 
—

 
3,604

TOTAL
 
$
918,591

 
$
22,684

 
$
(1,331
)
 
$
939,944

 
 
December 31, 2018
(Dollar amounts in thousands)
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value
U.S. Government agencies
 
$
25,617

 
$
218

 
$
(471
)
 
$
25,364

Mortgage Backed Securities-residential
 
182,050

 
723

 
(4,030
)
 
178,743

Collateralized mortgage obligations
 
352,823

 
217

 
(9,424
)
 
343,616

State and municipal obligations
 
232,457

 
2,767

 
(1,289
)
 
233,935

Collateralized debt obligations
 
137

 
3,121

 
—

 
3,258

TOTAL
 
$
793,084

 
$
7,046

 
$
(15,214
)
 
$
784,916
Schedule of contractual maturities of debt securities
Contractual maturities of debt securities at September 30, 2019 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
 
$
17,600

 
$
17,633

Due after one but within five years
 
64,741

 
65,565

Due after five but within ten years
 
73,343

 
75,416

Due after ten years
 
217,529

 
232,132

 
 
373,213

 
390,746

Mortgage-backed securities and collateralized mortgage obligations
 
545,378

 
549,198

TOTAL
 
$
918,591

 
$
939,944
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, 2019 and December 31, 2018. 
 
 
September 30, 2019
 
 
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
 
$
9,362

 
$
(44
)
 
$
—

 
$
—

 
$
9,362

 
$
(44
)
Mortgage Backed Securities - Residential
 
$
34,500

 
$
(129
)
 
$
22,585

 
$
(179
)
 
$
57,085

 
$
(308
)
Collateralized mortgage obligations
 
60,615

 
(186
)
 
65,977

 
(718
)
 
126,592

 
(904
)
State and municipal obligations
 
11,015

 
(37
)
 
459

 
(38
)
 
11,474

 
(75
)
U.S. Treasury
 
1,993

 
—

 
—

 
—

 
1,993

 
—

Total temporarily impaired securities
 
$
117,485

 
$
(396
)
 
$
89,021

 
$
(935
)
 
$
206,506

 
$
(1,331
)
 
 
 
December 31, 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
US Government Agencies
 
$
3,052

 
$
(4
)
 
$
11,356

 
$
(467
)
 
$
14,408

 
$
(471
)
Mortgage Backed Securities - Residential
 
$
39,997

 
$
(553
)
 
$
111,423

 
$
(3,477
)
 
$
151,420

 
$
(4,030
)
Collateralized mortgage obligations
 
52,838

 
(455
)
 
241,373

 
(8,969
)
 
294,211

 
(9,424
)
State and municipal obligations
 
34,229

 
(276
)
 
41,742

 
(1,013
)
 
75,971

 
(1,289
)
Total temporarily impaired securities
 
$
130,116

 
$
(1,288
)
 
$
405,894

 
$
(13,926
)
 
$
536,010

 
$
(15,214
)
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, 2019 and 2018:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(Dollar amounts in thousands)
 
2019
 
2018
 
2019
 
2018
Beginning balance
 
$
2,974

 
$
2,974

 
$
2,974

 
$
7,132

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
)
Ending balance
 
$
2,974

 
$
2,974

 
$
2,974

 
$
2,974