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SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Schedule of Securities
The amortized cost, gross unrealized losses and gains and estimated fair value of securities at December 31, 2016 and 2015 are summarized as follows (in thousands):
 
December 31, 2016
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
Trading:
 
 
 
 
 
 
 
U.S. Government and agency obligations
$
1,230

 
 
 
 
 
$
1,326

Municipal bonds
331

 
 
 
 
 
335

Corporate bonds
26,959

 
 
 
 
 
21,143

Mortgage-backed or related securities
1,620

 
 
 
 
 
1,641

Equity securities
14

 
 
 
 
 
123

 
$
30,154

 
 
 
 
 
$
24,568

Available-for-Sale:
 
 
 
 
 
 
 
U.S. Government and agency obligations
$
57,288

 
$
146

 
$
(456
)
 
$
56,978

Municipal bonds
110,487

 
455

 
(1,089
)
 
109,853

Corporate bonds
10,255

 
77

 
(49
)
 
10,283

Mortgage-backed or related securities
598,899

 
2,064

 
(6,251
)
 
594,712

Asset-backed securities
29,319

 
—

 
(326
)
 
28,993

Equity securities
88

 
10

 
—

 
98

 
$
806,336

 
$
2,752

 
$
(8,171
)
 
$
800,917

Held-to-Maturity:
 
 
 
 
 
 
 
U.S. Government and agency obligations
$
1,065

 
$
—

 
$
(18
)
 
$
1,047

Municipal bonds:
196,989

 
4,173

 
(1,272
)
 
199,890

Corporate bonds
3,876

 
—

 
—

 
3,876

Mortgage-backed or related securities
65,943

 
309

 
(537
)
 
65,715

 
$
267,873

 
$
4,482

 
$
(1,827
)
 
$
270,528

 
December 31, 2015
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
Trading:
 
 
 
 
 
 
 
U.S. Government and agency obligations
$
1,230

 
 
 
 
 
$
1,368

Municipal bonds
332

 
 
 
 
 
341

Corporate bonds
25,063

 
 
 
 
 
18,699

Mortgage-backed or related securities
12,705

 
 
 
 
 
13,663

Equity securities
14

 
 
 
 
 
63

 
$
39,344

 
 
 
 
 
$
34,134

Available-for-Sale:
 
 
 
 
 
 
 
U.S. Government and agency obligations
$
30,211

 
$
213

 
$
(193
)
 
$
30,231

Municipal bonds
142,898

 
853

 
(432
)
 
143,319

Corporate bonds
15,937

 
56

 
(12
)
 
15,981

Mortgage-backed or related securities
919,318

 
4,056

 
(5,115
)
 
918,259

Asset-backed securities
31,288

 
—

 
(603
)
 
30,685

Equity securities
88

 
10

 
—

 
98

 
$
1,139,740

 
$
5,188

 
$
(6,355
)
 
$
1,138,573

Held-to-Maturity:
 
 
 
 
 
 
 
U.S. Government and agency obligations
$
1,106

 
$
5

 
$
—

 
$
1,111

Municipal bonds:
162,778

 
6,219

 
(191
)
 
168,806

Corporate bonds
4,273

 
—

 
—

 
4,273

Mortgage-backed or related securities
52,509

 
253

 
(325
)
 
52,437

 
$
220,666

 
$
6,477

 
$
(516
)
 
$
226,627
Schedule of Securities with Continuous Loss Position
At December 31, 2016 and 2015, the gross unrealized losses and the fair value for securities available-for-sale and held-to-maturity aggregated by the length of time that individual securities have been in a continuous unrealized loss position was as follows (in thousands):
 
December 31, 2016
 
Less Than 12 Months
 
12 Months or More
 
Total
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
Available-for-Sale:
 
 
 
 
 
 
 
 
 
 
 
U.S. Government and agency obligations
$
39,043

 
$
(442
)
 
$
1,012

 
$
(14
)
 
$
40,055

 
$
(456
)
Municipal bonds
60,765

 
(1,087
)
 
556

 
(2
)
 
61,321

 
(1,089
)
Corporate bonds
5,206

 
(49
)
 
—

 
—

 
5,206

 
(49
)
Mortgage-backed or related securities
403,431

 
(5,604
)
 
47,467

 
(647
)
 
450,898

 
(6,251
)
Asset-backed securities
9,928

 
(101
)
 
19,064

 
(225
)
 
28,992

 
(326
)
 
$
518,373

 
$
(7,283
)
 
$
68,099

 
$
(888
)
 
$
586,472

 
$
(8,171
)
Held-to-Maturity:
 
 
 
 
 
 
 
 
 
 
 
U.S. Government and agency obligations
$
1,047

 
$
(18
)
 
$
—

 
$
—

 
$
1,047

 
$
(18
)
Municipal bonds
$
64,802

 
$
(1,267
)
 
$
204

 
$
(5
)
 
$
65,006

 
$
(1,272
)
Mortgage-backed or related securities
42,245

 
(537
)
 
—

 
—

 
42,245

 
(537
)
 
$
108,094

 
$
(1,822
)
 
$
204

 
$
(5
)
 
$
108,298

 
$
(1,827
)
 
 
December 31, 2015
 
Less Than 12 Months
 
12 Months or More
 
Total
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
Available-for-Sale:
 
 
 
 
 
 
 
 
 
 
 
U.S. Government and agency obligations
$
8,707

 
$
(97
)
 
$
10,489

 
$
(96
)
 
$
19,196

 
$
(193
)
Municipal bonds
69,848

 
(426
)
 
905

 
(6
)
 
70,753

 
(432
)
Corporate bonds
5,153

 
(12
)
 
—

 
—

 
5,153

 
(12
)
Mortgage-backed or related securities
533,143

 
(4,380
)
 
68,562

 
(735
)
 
601,705

 
(5,115
)
Asset-backed securities
20,893

 
(355
)
 
9,792

 
(248
)
 
30,685

 
(603
)
 
$
637,744

 
$
(5,270
)
 
$
89,748

 
$
(1,085
)
 
$
727,492

 
$
(6,355
)
Held-to-Maturity:
 
 
 
 
 
 
 
 
 
 
 
Municipal bonds
$
28,545

 
$
(188
)
 
$
254

 
$
(3
)
 
$
28,799

 
$
(191
)
Mortgage-backed or related securities
34,493

 
(323
)
 
255

 
(2
)
 
34,748

 
(325
)
 
$
63,038

 
$
(511
)
 
$
509

 
$
(5
)
 
$
63,547

 
$
(516
)
Schedule of Securities by Contractual Maturity Date
The amortized cost and estimated fair value of securities at December 31, 2016, by contractual maturity, are shown below (in thousands).  Expected maturities will differ from contractual maturities because some securities may be called or prepaid with or without call or prepayment penalties.
 
December 31, 2016
 
Trading
 
Available-for-Sale
 
Held-to-Maturity
 
Amortized Cost
 
Fair Value
 
Amortized Cost
 
Fair Value
 
Amortized Cost
 
Fair Value
Maturing in one year or less
$
1,751

 
$
1,775

 
$
13,077

 
$
13,063

 
$
1,962

 
$
1,975

Maturing after one year through five years
230

 
231

 
120,405

 
120,126

 
18,988

 
19,000

Maturing after five years through ten years
1,200

 
1,296

 
176,010

 
173,720

 
113,587

 
114,336

Maturing after ten years through twenty years
—

 
—

 
188,557

 
187,940

 
88,546

 
91,098

Maturing after twenty years
26,959

 
21,143

 
308,199

 
305,970

 
44,790

 
44,119

 
30,140

 
24,445

 
806,248

 
800,819

 
267,873

 
270,528

Equity securities
14

 
123

 
88

 
98

 
—

 
—

 
$
30,154

 
$
24,568

 
$
806,336

 
$
800,917

 
$
267,873

 
$
270,528
Schedule of Pledged Securities
The following table presents, as of December 31, 2016, investment securities which were pledged to secure borrowings, public deposits or other obligations as permitted or required by law (in thousands):
 
Carrying Value
 
Amortized Cost
 
Fair Value
Purpose or beneficiary:
 
 
 
 
 
State and local governments public deposits
$
203,510

 
$
203,474

 
$
207,013

Interest rate swap counterparties
24,393

 
24,447

 
24,287

Repurchase transaction accounts
114,949

 
115,650

 
114,864

Other
1,778

 
1,782

 
1,778

Total pledged securities
$
344,630

 
$
345,353

 
$
347,942