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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Reconciliation of available for sale securities
The amortized cost, gross unrealized gains, gross unrealized losses and fair values of investment securities available for sale at the dates indicated were as follows:
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
(In thousands)
December 31, 2018
 
 
 
 
 
 
 
U.S. Treasury and U.S. Government-sponsored agencies
$
101,595

 
$
155

 
$
(147
)
 
$
101,603

Municipal securities
158,461

 
1,209

 
(806
)
 
158,864

Mortgage-backed securities and collateralized mortgage obligations (1):
 
 
 
 
 
 

Residential
337,295

 
426

 
(6,119
)
 
331,602

Commercial
338,250

 
1,035

 
(5,524
)
 
333,761

Corporate obligations
25,662

 
36

 
(135
)
 
25,563

Other asset-backed securities
24,278

 
424

 
—

 
24,702

Total
$
985,541


$
3,285


$
(12,731
)

$
976,095

 
 
 
 
 
 
 
 
December 31, 2017
 
 
 
 
 
 
 
U.S. Treasury and U.S. Government-sponsored agencies
$
13,460

 
$
6

 
$
(24
)
 
$
13,442

Municipal securities
247,358

 
3,720

 
(1,063
)
 
250,015

Mortgage-backed securities and collateralized mortgage obligations (1):
 
 
 
 
 
 

Residential
282,724

 
422

 
(2,935
)
 
280,211

Commercial
219,696

 
444

 
(3,061
)
 
217,079

Collateralized loan obligations
4,561

 
19

 
—

 
4,580

Corporate obligations
16,594

 
220

 
(44
)
 
16,770

Other securities (2)
27,781

 
652

 
—

 
28,433

Total
$
812,174


$
5,483


$
(7,127
)

$
810,530

(1) 
Issued and guaranteed by U.S. Government-sponsored agencies.
(2) 
Primarily asset-backed securities.
Schedule of securities available for sale
The amortized cost and fair value of investment securities available for sale at December 31, 2018, by contractual maturity, are set forth below. Actual maturities may differ from contractual maturities because certain borrowers have the right to call or prepay obligations with or without call or prepayment penalties.
 
Amortized Cost
 
Fair Value
 
(In thousands)
Due in one year or less
$
38,547

 
$
38,478

Due after one year through five years
193,191

 
192,556

Due after five years through ten years
272,408

 
268,779

Due after ten years
481,395

 
476,282

Total
$
985,541


$
976,095
Schedule of fair value and unrealized losses of available for sale investment securities
The following table shows the gross unrealized losses and fair value of the Company's investment securities available for sale that are not deemed to be other-than-temporarily impaired, aggregated by investment category and length of time that the individual securities have been in continuous unrealized loss positions as of December 31, 2018 and December 31, 2017:
 
Less than 12 Months
 
12 Months or Longer
 
Total
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
(In thousands)
December 31, 2018
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and U.S. Government-sponsored agencies
$
46,992

 
$
(58
)
 
$
7,350

 
$
(89
)
 
$
54,342

 
$
(147
)
Municipal securities
31,157

 
(159
)
 
38,792

 
(647
)
 
69,949

 
(806
)
Mortgage-backed securities and collateralized mortgage obligations (1):
 
 
 
 
 
 
 
 

 

Residential
66,620

 
(247
)
 
193,726

 
(5,872
)
 
260,346

 
(6,119
)
Commercial
43,531

 
(272
)
 
190,585

 
(5,252
)
 
234,116

 
(5,524
)
Corporate obligations
13,736

 
(87
)
 
1,951

 
(48
)
 
15,687

 
(135
)
Total
$
202,036


$
(823
)

$
432,404


$
(11,908
)

$
634,440


$
(12,731
)
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and U.S. Government-sponsored agencies
$
11,436

 
$
(24
)
 
$
—

 
$
—

 
$
11,436

 
$
(24
)
Municipal securities
39,298

 
(384
)
 
26,509

 
(679
)
 
65,807

 
(1,063
)
Mortgage-backed securities and collateralized mortgage obligations (1):
 
 
 
 
 
 
 
 
 
 
 
Residential
175,847

 
(1,296
)
 
66,380

 
(1,639
)
 
242,227

 
(2,935
)
Commercial
75,121

 
(700
)
 
90,822

 
(2,361
)
 
165,943

 
(3,061
)
Corporate obligations
3,472

 
(44
)
 
—

 
—

 
3,472

 
(44
)
Total
$
305,174


$
(2,448
)

$
183,711


$
(4,679
)

$
488,885


$
(7,127
)
(1) Issued and guaranteed by U.S. Government-sponsored agencies.
Gross realized gains and losses on sale of securities available for sale
he following table presents the gross realized gains and losses on the sale of securities available for sale for the years ended December 31, 2018, 2017 and 2016:

 
Year ended December 31,
 
2018
 
2017
 
2016
 
(In thousands)
Gross realized gains
$
273

 
$
193

 
$
1,518

Gross realized losses
(136
)
 
(187
)
 
(203
)
Net realized gains
$
137

 
$
6

 
$
1,315
Scheduled of amortized cost and fair value of securities pledged as collateral
The following table summarizes the amortized cost and fair value of investment securities available for sale that are pledged as collateral for the following obligations at December 31, 2018 and December 31, 2017:
 
December 31, 2018
 
December 31, 2017
 
Amortized
Cost
 
Fair
Value
 
Amortized
Cost
 
Fair
Value
 
(In thousands)
Washington and Oregon state to secure public deposits
$
199,026

 
$
196,786

 
$
206,377

 
$
206,425

Repurchase agreements
48,173

 
47,407

 
48,750

 
48,237

Other securities pledged
20,778

 
20,482

 
12,484

 
12,498

Total
$
267,977


$
264,675


$
267,611


$
267,160