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Securities (Tables)
 3 Months Ended
Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Amortized cost and fair value of investments classified as available-for-sale
 
 
 
 
 
March 31, 2017
(Dollar amounts in thousands)
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value
U.S. Government agencies
 
$
13,353

 
$
43

 
$
(170
)
 
$
13,226

Mortgage Backed Securities - residential
 
250,202

 
3,351

 
(1,999
)
 
251,554

Mortgage Backed Securities - commercial
 
3

 
—

 
—

 
3

Collateralized mortgage obligations
 
359,080

 
1,304

 
(5,334
)
 
355,050

State and municipal obligations
 
220,735

 
4,682

 
(1,562
)
 
223,855

Collateralized debt obligations
 
9,061

 
2,932

 
—

 
11,993

TOTAL
 
$
852,434

 
$
12,312

 
$
(9,065
)
 
$
855,681

 
 
 
 
 
December 31, 2016
(Dollar amounts in thousands)
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value
U.S. Government agencies
 
$
13,594

 
$
32

 
$
(377
)
 
$
13,249

Mortgage Backed Securities-residential
 
261,878

 
3,200

 
(4,073
)
 
261,005

Mortgage Backed Securities-commercial
 
4

 
—

 
—

 
4

Collateralized mortgage obligations
 
353,499

 
1,021

 
(6,344
)
 
348,176

State and municipal obligations
 
217,365

 
3,954

 
(2,396
)
 
218,923

Collateralized debt obligations
 
9,181

 
4,411

 
(1,224
)
 
12,368

TOTAL
 
$
855,521

 
$
12,618

 
$
(14,414
)
 
$
853,725
Schedule of contractual maturities of debt securities
Contractual maturities of debt securities at March 31, 2017 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
 
$
5,085

 
$
5,118

Due after one but within five years
 
47,719

 
48,850

Due after five but within ten years
 
84,849

 
87,510

Due after ten years
 
105,496

 
107,596

 
 
243,149

 
249,074

Mortgage-backed securities and collateralized mortgage obligations
 
609,285

 
606,607

TOTAL
 
$
852,434

 
$
855,681
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 March 31, 2017 and December 31, 2016. 
 
 
March 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
U.S. Government agencies
 
$
3,713

 
$
(170
)
 
$
—

 
$
—

 
$
3,713

 
$
(170
)
Mortgage Backed Securities - Residential
 
$
132,684

 
$
(1,998
)
 
$
151

 
$
(1
)
 
$
132,835

 
$
(1,999
)
Mortgage Backed Securities - Commercial
 
1

 
—

 
—

 
—

 
1

 
—

Collateralized mortgage obligations
 
161,147

 
(2,372
)
 
81,569

 
(2,962
)
 
242,716

 
(5,334
)
State and municipal obligations
 
54,121

 
(1,562
)
 
288

 
—

 
54,409

 
(1,562
)
Total temporarily impaired securities
 
$
351,666

 
$
(6,102
)
 
$
82,008

 
$
(2,963
)
 
$
433,674

 
$
(9,065
)
 
 
 
December 31, 2016
 
 
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
 
$
12,224

 
$
(377
)
 
$
—

 
$
—

 
$
12,224

 
$
(377
)
Mortgage Backed Securities - Residential
 
$
202,248

 
$
(4,072
)
 
$
152

 
$
(1
)
 
$
202,400

 
$
(4,073
)
Collateralized mortgage obligations
 
169,717

 
(3,086
)
 
79,999

 
(3,258
)
 
249,716

 
(6,344
)
State and municipal obligations
 
72,852

 
(2,396
)
 
—

 
—

 
72,852

 
(2,396
)
Collateralized Debt Obligations
 
7,561

 
(1,224
)
 
—

 
—

 
7,561

 
(1,224
)
Total temporarily impaired securities
 
$
464,602

 
$
(11,155
)
 
$
80,151

 
$
(3,259
)
 
$
544,753

 
$
(14,414
)
Rollforward of the credit losses recognized in earnings
The table below presents a rollforward of the credit losses recognized in earnings for the three month period ended March 31, 2017 and 2016:
 
 
Three Months Ended March 31,
 
(Dollar amounts in thousands)
 
2017
 
2016
 
Beginning balance
 
$
13,974

 
$
14,050

 
Increases to the amount related to the credit
 
 

 
 

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

 
—

 
Reductions for increases in cash flows collected
 
—

 
(55
)
 
Amounts recognized for securities called during the period
 
(6,842
)
 
—

 
Ending balance
 
$
7,132

 
$
13,995