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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2015
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, 2015
 
 
 
 
 
 
 
Equity securities
$
16,087

 
$
7,453

 
$
(8
)
 
$
23,532

U.S. Government sponsored agency securities
48,320

 
231

 
—

 
48,551

State and municipal securities
234,868

 
5,430

 
(62
)
 
240,236

Corporate debt securities
102,297

 
2,935

 
(5,291
)
 
99,941

Collateralized mortgage obligations
879,738

 
5,638

 
(11,077
)
 
874,299

Mortgage-backed securities
1,036,193

 
16,845

 
(1,133
)
 
1,051,905

Auction rate securities
106,661

 
—

 
(8,788
)
 
97,873

 
$
2,424,164

 
$
38,532

 
$
(26,359
)
 
$
2,436,337

 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair
Value
 
(in thousands)
December 31, 2014
 
 
 
 
 
 
 
Equity securities
$
33,469

 
$
14,167

 
$
(13
)
 
$
47,623

U.S. Government securities
200

 
—

 
—

 
200

U.S. Government sponsored agency securities
209

 
5

 
—

 
214

State and municipal securities
238,250

 
7,231

 
(266
)
 
245,215

Corporate debt securities
99,016

 
5,126

 
(6,108
)
 
98,034

Collateralized mortgage obligations
917,395

 
5,705

 
(20,787
)
 
902,313

Mortgage-backed securities
914,797

 
16,978

 
(2,944
)
 
928,831

Auction rate securities
108,751

 
—

 
(7,810
)
 
100,941

 
$
2,312,087

 
$
49,212

 
$
(37,928
)
 
$
2,323,371
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, 2015, by contractual maturity, are shown in the following table. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
 
 
Amortized
Cost
 
Estimated
Fair Value
 
(in thousands)
Due in one year or less
 
$
62,247

 
$
63,023

Due from one year to five years
 
104,989

 
107,283

Due from five years to ten years
 
132,930

 
136,571

Due after ten years
 
191,980

 
179,724

 
 
492,146

 
486,601

Collateralized mortgage obligations
 
879,738

 
874,299

Mortgage-backed securities
 
1,036,193

 
1,051,905

 
 
$
2,408,077

 
$
2,412,805
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
 
Other-than-
temporary
Impairment
Losses
 
Net Gains (Losses)
Three months ended September 30, 2015
(in thousands)
Equity securities
$
1,730

 
$
—

 
$
—

 
$
1,730

Debt securities
—

 
—

 
—

 
—

Total
$
1,730

 
$
—

 
$
—

 
$
1,730

Three months ended September 30, 2014
 
 
 
 
 
 
 
Equity securities
$
99

 
$
—

 
$
—

 
$
99

Debt securities
—

 
—

 
(18
)
 
(18
)
Total
$
99

 
$
—

 
$
(18
)
 
$
81

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

 
$
—

 
$
—

 
$
5,990

Debt securities
2,300

 
—

 
—

 
2,300

Total
$
8,290

 
$
—

 
$
—

 
$
8,290

Nine months ended September 30, 2014
 
 
 
 
 
 
 
Equity securities
$
100

 
$
—

 
$
(12
)
 
$
88

Debt securities
1,446

 
(323
)
 
(18
)
 
1,105

Total
$
1,546

 
$
(323
)
 
$
(30
)
 
$
1,193
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, 2015 and 2014:
 
Three months ended September 30
 
Nine months ended September 30
 
2015
 
2014
 
2015
 
2014
 
(in thousands)
Balance of cumulative credit losses on debt securities, beginning of period
$
(11,510
)
 
$
(17,214
)
 
$
(16,242
)
 
$
(20,691
)
Additions for credit losses recorded which were not previously recognized as components of earnings
—

 
(18
)
 
—

 
(18
)
Reductions for securities sold during the period
—

 
—

 
4,730

 
3,472

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

 
—

 
2

 
5

Balance of cumulative credit losses on debt securities, end of period
$
(11,510
)
 
$
(17,232
)
 
$
(11,510
)
 
$
(17,232
)
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, 2015:
 
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)
U.S. Government sponsored agency securities
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

State and municipal securities
11,892

 
(62
)
 
—

 
—

 
11,892

 
(62
)
Corporate debt securities
7,968

 
(15
)
 
33,718

 
(5,276
)
 
41,686

 
(5,291
)
Collateralized mortgage obligations
30,723

 
(62
)
 
493,703

 
(11,015
)
 
524,426

 
(11,077
)
Mortgage-backed securities
161,097

 
(443
)
 
67,071

 
(690
)
 
228,168

 
(1,133
)
Auction rate securities
—

 
—

 
97,873

 
(8,788
)
 
97,873

 
(8,788
)
Total debt securities
211,680

 
(582
)
 
692,365

 
(25,769
)
 
904,045

 
(26,351
)
Equity securities
—

 
—

 
13

 
(8
)
 
13

 
(8
)
 
$
211,680

 
$
(582
)
 
$
692,378

 
$
(25,777
)
 
$
904,058

 
$
(26,359
)
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, 2015
 
December 31, 2014
 
Amortized
cost
 
Estimated
fair value
 
Amortized
cost
 
Estimated
fair value
 
(in thousands)
Single-issuer trust preferred securities
$
46,624

 
$
41,787

 
$
47,569

 
$
42,016

Subordinated debt
51,625

 
53,576

 
47,530

 
50,023

Pooled trust preferred securities
—

 
530

 
2,010

 
4,088

Corporate debt securities issued by financial institutions
98,249

 
95,893

 
97,109

 
96,127

Other corporate debt securities
4,048

 
4,048

 
1,907

 
1,907

Available for sale corporate debt securities
$
102,297

 
$
99,941

 
$
99,016

 
$
98,034