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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost and Fair Values of Investment Securities
The following table presents the amortized cost and estimated fair values of investment securities, which were all classified as available for sale:
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair
Value
 
(in thousands)
September 30, 2016
 
 
 
 
 
 
 
U.S. Government sponsored agency securities
$
137

 
$
3

 
$
—

 
$
140

State and municipal securities
394,162

 
8,145

 
(735
)
 
401,572

Corporate debt securities
109,495

 
3,096

 
(5,350
)
 
107,241

Collateralized mortgage obligations
651,060

 
4,070

 
(2,771
)
 
652,359

Mortgage-backed securities
1,201,771

 
24,790

 
(14
)
 
1,226,547

Auction rate securities
107,107

 
—

 
(9,381
)
 
97,726

   Total debt securities
2,463,732

 
40,104

 
(18,251
)
 
2,485,585

Equity securities
14,206

 
8,277

 
—

 
22,483

   Total
$
2,477,938

 
$
48,381

 
$
(18,251
)
 
$
2,508,068

 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair
Value
 
(in thousands)
December 31, 2015
 
 
 
 
 
 
 
U.S. Government sponsored agency securities
$
25,154

 
$
35

 
$
(53
)
 
$
25,136

State and municipal securities
256,746

 
6,019

 
—

 
262,765

Corporate debt securities
100,336

 
2,695

 
(6,076
)
 
96,955

Collateralized mortgage obligations
835,439

 
3,042

 
(16,972
)
 
821,509

Mortgage-backed securities
1,154,935

 
10,104

 
(6,204
)
 
1,158,835

Auction rate securities
106,772

 
—

 
(8,713
)
 
98,059

   Total debt securities
2,479,382

 
21,895

 
(38,018
)
 
2,463,259

Equity securities
14,677

 
6,845

 
(8
)
 
21,514

   Total
$
2,494,059

 
$
28,740

 
$
(38,026
)
 
$
2,484,773
Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities
The amortized cost and estimated fair values of debt securities as of September 30, 2016, by contractual maturity, are shown in the following table. Actual maturities may differ from contractual maturities as certain investment securities are subject to call or prepayment with or without call or prepayment penalties.
 
 
Amortized
Cost
 
Estimated
Fair Value
 
(in thousands)
Due in one year or less
 
$
50,521

 
$
51,020

Due from one year to five years
 
34,278

 
35,356

Due from five years to ten years
 
96,172

 
99,187

Due after ten years
 
429,930

 
421,116

 
 
610,901

 
606,679

Collateralized mortgage obligations
 
651,060

 
652,359

Mortgage-backed securities
 
1,201,771

 
1,226,547

  Total debt securities
 
$
2,463,732

 
$
2,485,585
Summary of Gains and Losses from Equity and Debt Securities, and Losses Recognized from Other-than-Temporary Impairment
The following table presents information related to the gross realized gains and losses on the sales of equity and debt securities:
 
Gross
Realized
Gains
 
Gross
Realized
Losses
 
Net Gains (Losses)
Three months ended September 30, 2016
(in thousands)
Equity securities
$
2

 
$
—

 
$
2

Debt securities
—

 
—

 
—

Total
$
2

 
$
—

 
$
2

Three months ended September 30, 2015
 
 
 
 
 
Equity securities
$
1,730

 
$
—

 
$
1,730

Debt securities
—

 
—

 
—

Total
$
1,730

 
$
—

 
$
1,730

 
 
 
 
 
 
Nine months ended September 30, 2016
 
 
 
 
 
Equity securities
$
739

 
$
(10
)
 
$
729

Debt securities
322

 
(26
)
 
296

Total
$
1,061

 
$
(36
)
 
$
1,025

Nine months ended September 30, 2015
 
 
 
 
 
Equity securities
$
5,990

 
$
—

 
$
5,990

Debt securities
2,300

 
—

 
2,300

Total
$
8,290

 
$
—

 
$
8,290
Summary Of Other Than Temporary Impairment Charges Recorded In Statement Of Operations [Table Text Block]
The following table presents a summary of the cumulative credit related other-than-temporary impairment charges, recognized as components of earnings, for debt securities held by the Corporation at September 30, 2016 and 2015:
 
Three months ended September 30
 
Nine months ended September 30
 
2016
 
2015
 
2016
 
2015
 
(in thousands)
Balance of cumulative credit losses on debt securities, beginning of period
$
(11,510
)
 
$
(11,510
)
 
$
(11,510
)
 
$
(16,242
)
Reductions for securities sold during the period
—

 
—

 
—

 
4,730

Reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security
—

 
—

 
—

 
2

Balance of cumulative credit losses on debt securities, end of period
$
(11,510
)
 
$
(11,510
)
 
$
(11,510
)
 
$
(11,510
)
Gross Unrealized Losses and Fair Values of Investments by Category and Length of Time in Continuous Unrealized Loss Position
The following table presents the gross unrealized losses and estimated fair values of investments, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at September 30, 2016:
 
Less than 12 months
 
12 months or longer
 
Total
 
Estimated
Fair Value
 
Unrealized
Losses
 
Estimated
Fair Value
 
Unrealized
Losses
 
Estimated
Fair Value
 
Unrealized
Losses
 
(in thousands)
State and municipal securities
$
91,790

 
$
(735
)
 
$
—

 
$
—

 
$
91,790

 
$
(735
)
Corporate debt securities
4,000

 
(35
)
 
33,766

 
(5,315
)
 
37,766

 
(5,350
)
Collateralized mortgage obligations
124,739

 
(376
)
 
266,062

 
(2,395
)
 
390,801

 
(2,771
)
Mortgage-backed securities
6,171

 
(14
)
 
—

 
—

 
6,171

 
(14
)
Auction rate securities
—

 
—

 
97,726

 
(9,381
)
 
97,726

 
(9,381
)
Total debt securities
226,700

 
(1,160
)
 
397,554

 
(17,091
)
 
624,254

 
(18,251
)
Equity securities
—

 
—

 
—

 
—

 
—

 
—

Total
$
226,700

 
$
(1,160
)
 
$
397,554

 
$
(17,091
)
 
$
624,254

 
$
(18,251
)
Summary of Amortized Cost and Fair Values of Corporate Debt Securities
The following table presents the amortized cost and estimated fair value of corporate debt securities:
 
September 30, 2016
 
December 31, 2015
 
Amortized
cost
 
Estimated
fair value
 
Amortized
cost
 
Estimated
fair value
 
(in thousands)
Single-issuer trust preferred securities
$
43,720

 
$
39,253

 
$
44,648

 
$
39,106

Subordinated debt
43,715

 
44,660

 
39,610

 
40,779

Senior debt
18,039

 
18,601

 
12,043

 
12,329

Pooled trust preferred securities
—

 
706

 
—

 
706

Corporate debt securities issued by financial institutions
105,474

 
103,220

 
96,301

 
92,920

Other corporate debt securities
4,021

 
4,021

 
4,035

 
4,035

Available for sale corporate debt securities
$
109,495

 
$
107,241

 
$
100,336

 
$
96,955