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Securities (Tables)
 3 Months Ended
Mar. 31, 2019
Gain (Loss) on Securities [Line Items]  
Schedule of Equity securities gains and losses [Table Text Block] The following table represents a summary of the gains and losses that relates to equity securities for the periods indicated:
 
Three Months Ended
 
March 31
 
2019
 
2018
Net gains (losses) recognized during the period on equity securities
$
907

 
$
(485
)
Less: net gains recognized during the period on equity securities sold during the period
3

 
2

Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date
$
904

 
$
(487
)
Reconciliation of fair value of securities The following table presents a summary of the amortized cost, gross unrealized gains and losses, and fair value of securities available for sale and securities held to maturity for the periods indicated:
 
March 31, 2019
 
December 31, 2018
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross Unrealized
Losses
 
Fair
Value
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross Unrealized
Losses
 
Fair
Value
 
(Dollars in thousands)
Available for sale securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government agency securities
$
32,477

 
$
25

 
$
(47
)
 
$
32,455

 
$
32,477

 
$
—

 
$
(439
)
 
$
32,038

Agency mortgage-backed securities
217,163

 
1,674

 
(1,042
)
 
217,795

 
222,491

 
1,020

 
(3,406
)
 
220,105

Agency collateralized mortgage obligations
133,025

 
338

 
(1,832
)
 
131,531

 
138,149

 
197

 
(3,435
)
 
134,911

State, county, and municipal securities
1,716

 
23

 
—

 
1,739

 
1,719

 
16

 
—

 
1,735

Single issuer trust preferred securities issued by banks
717

 
4

 
—

 
721

 
717

 
—

 
(10
)
 
707

Pooled trust preferred securities issued by banks and insurers
1,660

 
—

 
(346
)
 
1,314

 
1,678

 
—

 
(349
)
 
1,329

Small business administration pooled securities
52,549

 
160

 
(575
)
 
52,134

 
53,317

 
—

 
(1,390
)
 
51,927

Total available for sale securities
$
439,307

 
$
2,224

 
$
(3,842
)
 
$
437,689

 
$
450,548

 
$
1,233

 
$
(9,029
)
 
$
442,752

Held to maturity securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury securities
$
1,004

 
$
13

 
$
—

 
$
1,017

 
$
1,004

 
$
11

 
$
—

 
$
1,015

Agency mortgage-backed securities
259,599

 
3,238

 
(955
)
 
261,882

 
252,484

 
1,548

 
(3,104
)
 
250,928

Agency collateralized mortgage obligations
337,804

 
2,208

 
(4,307
)
 
335,705

 
332,775

 
869

 
(6,920
)
 
326,724

Single issuer trust preferred securities issued by banks
1,500

 
—

 
(10
)
 
1,490

 
1,500

 
—

 
(10
)
 
1,490

Small business administration pooled securities
23,336

 
115

 
(389
)
 
23,062

 
23,727

 
105

 
(349
)
 
23,483

Total held to maturity securities
$
623,243

 
$
5,574

 
$
(5,661
)
 
$
623,156

 
$
611,490

 
$
2,533

 
$
(10,383
)
 
$
603,640

Total
$
1,062,550

 
$
7,798

 
$
(9,503
)
 
$
1,060,845

 
$
1,062,038

 
$
3,766

 
$
(19,412
)
 
$
1,046,392
Schedule of contractual maturities of securities A schedule of the contractual maturities of securities available for sale and securities held to maturity as of March 31, 2019 is presented below:
 
Due in one year or less
 
Due after one year to five years
 
Due after five to ten years
 
Due after ten years
 
Total
 
Amortized
Cost
 
Fair
Value
 
Amortized
Cost
 
Fair
Value
 
Amortized
Cost
 
Fair
Value
 
Amortized
Cost
 
Fair
Value
 
Amortized
Cost
 
Fair
Value
 
(Dollars in thousands)
Available for sale securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government agency securities
$
10,005

 
$
9,965

 
$
10,003

 
$
10,028

 
$
12,469

 
$
12,462

 
$
—

 
$
—

 
$
32,477

 
$
32,455

Agency mortgage-backed securities
7

 
7

 
52,054

 
51,871

 
88,335

 
88,705

 
76,767

 
77,212

 
217,163

 
217,795

Agency collateralized mortgage obligations
—

 
—

 
—

 
—

 
—

 
—

 
133,025

 
131,531

 
133,025

 
131,531

State, county, and municipal securities
—

 
—

 
1,022

 
1,026

 
694

 
713

 
—

 
—

 
1,716

 
1,739

Single issuer trust preferred securities issued by banks
—

 
—

 
—

 
—

 
—

 
—

 
717

 
721

 
717

 
721

Pooled trust preferred securities issued by banks and insurers
—

 
—

 
—

 
—

 
—

 
—

 
1,660

 
1,314

 
1,660

 
1,314

Small business administration pooled securities
—

 
—

 
—

 
—

 
—

 
—

 
52,549

 
52,134

 
52,549

 
52,134

Total available for sale securities
$
10,012

 
$
9,972

 
$
63,079

 
$
62,925

 
$
101,498

 
$
101,880

 
$
264,718

 
$
262,912

 
$
439,307

 
$
437,689

Held to maturity securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury securities
$
—

 
$
—

 
$
1,004

 
$
1,017

 
$
—

 
$
—

 
$
—

 
$
—

 
$
1,004

 
$
1,017

Agency mortgage-backed securities
—

 
—

 
11,786

 
11,724

 
34,127

 
34,044

 
213,686

 
216,114

 
259,599

 
261,882

Agency collateralized mortgage obligations
—

 
—

 
—

 
—

 
553

 
551

 
337,251

 
335,154

 
337,804

 
335,705

Single issuer trust preferred securities issued by banks
—

 
—

 
—

 
—

 
1,500

 
1,490

 
—

 
—

 
1,500

 
1,490

Small business administration pooled securities
—

 
—

 
—

 
—

 
—

 
—

 
23,336

 
23,062

 
23,336

 
23,062

Total held to maturity securities
$
—

 
$
—

 
$
12,790

 
$
12,741

 
$
36,180

 
$
36,085

 
$
574,273

 
$
574,330

 
$
623,243

 
$
623,156

Total
$
10,012

 
$
9,972

 
$
75,869

 
$
75,666

 
$
137,678

 
$
137,965

 
$
838,991

 
$
837,242

 
$
1,062,550

 
$
1,060,845
Schedule of gross unrealized losses and fair value of investments The following tables show the gross unrealized losses and fair value of the Company’s investments in an unrealized loss position, which the Company has not deemed to be OTTI, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position:
 
March 31, 2019
 
 
 
Less than 12 months
 
12 months or longer
 
Total
 
# of 
holdings
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
(Dollars in thousands)
U.S. government agency securities
3

 
$
4,306

 
$
(1
)
 
$
22,428

 
$
(46
)
 
$
26,734

 
$
(47
)
Agency mortgage-backed securities
110

 
—

 
—

 
246,113

 
(1,997
)
 
246,113

 
(1,997
)
Agency collateralized mortgage obligations
41

 
—

 
—

 
285,297

 
(6,139
)
 
285,297

 
(6,139
)
Single issuer trust preferred securities issued by banks and insurers
1

 
1,490

 
(10
)
 
—

 
—

 
1,490

 
(10
)
Pooled trust preferred securities issued by banks and insurers
1

 
—

 
—

 
1,314

 
(346
)
 
1,314

 
(346
)
Small business administration pooled securities
6

 
—

 
—

 
59,347

 
(964
)
 
59,347

 
(964
)
Total temporarily impaired securities
162

 
$
5,796

 
$
(11
)
 
$
614,499

 
$
(9,492
)
 
$
620,295

 
$
(9,503
)

 
December 31, 2018
 
 
 
Less than 12 months
 
12 months or longer
 
Total
 
# of 
holdings
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
(Dollars in thousands)
U.S.government agency securities
3

 
$
9,960

 
$
(43
)
 
$
22,078

 
$
(396
)
 
$
32,038

 
$
(439
)
Agency mortgage-backed securities
144

 
104,616

 
(1,363
)
 
222,850

 
(5,147
)
 
327,466

 
(6,510
)
Agency collateralized mortgage obligations
48

 
57,871

 
(398
)
 
279,229

 
(9,957
)
 
337,100

 
(10,355
)
Single issuer trust preferred securities issued by banks and insurers
2

 
2,197

 
(20
)
 
—

 
—

 
2,197

 
(20
)
Pooled trust preferred securities issued by banks and insurers
1

 
—

 
—

 
1,329

 
(349
)
 
1,329

 
(349
)
Small business administration pooled securities
7

 
28,257

 
(662
)
 
40,621

 
(1,077
)
 
68,878

 
(1,739
)
Total temporarily impaired securities
205

 
$
202,901

 
$
(2,486
)
 
$
566,107

 
$
(16,926
)
 
$
769,008

 
$
(19,412
)