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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 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)
March 31, 2015
 
 
 
 
 
 
 
Equity securities
$
29,224

 
$
11,397

 
$
(13
)
 
$
40,608

U.S. Government sponsored agency securities
198

 
5

 
—

 
203

State and municipal securities
216,877

 
7,496

 
(31
)
 
224,342

Corporate debt securities
99,120

 
3,929

 
(5,367
)
 
97,682

Collateralized mortgage obligations
874,853

 
5,924

 
(12,901
)
 
867,876

Mortgage-backed securities
910,418

 
20,859

 
(1,118
)
 
930,159

Auction rate securities
106,410

 
—

 
(7,478
)
 
98,932

 
$
2,237,100

 
$
49,610

 
$
(26,908
)
 
$
2,259,802

 
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 March 31, 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
 
$
29,323

 
$
30,124

Due from one year to five years
 
74,801

 
78,246

Due from five years to ten years
 
140,219

 
144,978

Due after ten years
 
178,262

 
167,811

 
 
422,605

 
421,159

Collateralized mortgage obligations
 
874,853

 
867,876

Mortgage-backed securities
 
910,418

 
930,159

 
 
$
2,207,876

 
$
2,219,194
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 March 31, 2015
(in thousands)
Equity securities
$
1,970

 
$
—

 
$
1,970

Debt securities
2,175

 
—

 
2,175

Total
$
4,145

 
$
—

 
$
4,145

Three months ended March 31, 2014
 
 
 
 
 
Equity securities
$
1

 
$
—

 
$
1

Debt securities
322

 
(323
)
 
(1
)
Total
$
323

 
$
(323
)
 
$
—
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 March 31, 2015 and 2014:
 
Three months ended March 31
 
2015
 
2014
 
(in thousands)
Balance of cumulative credit losses on debt securities, beginning of period
$
(16,242
)
 
$
(20,691
)
Reductions for securities sold during the period
3,938

 
—

Reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security
2

 
4

Balance of cumulative credit losses on debt securities, end of period
$
(12,302
)
 
$
(20,687
)
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 March 31, 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)
State and municipal securities
$
5,953

 
$
(31
)
 
$
—

 
$
—

 
$
5,953

 
$
(31
)
Corporate debt securities
4,970

 
(4
)
 
34,600

 
(5,363
)
 
39,570

 
(5,367
)
Collateralized mortgage obligations
34,287

 
(132
)
 
547,418

 
(12,769
)
 
581,705

 
(12,901
)
Mortgage-backed securities
116,136

 
(327
)
 
72,224

 
(791
)
 
188,360

 
(1,118
)
Auction rate securities
—

 
—

 
98,932

 
(7,478
)
 
98,932

 
(7,478
)
Total debt securities
161,346

 
(494
)
 
753,174

 
(26,401
)
 
914,520

 
(26,895
)
Equity securities
—

 
—

 
77

 
(13
)
 
77

 
(13
)
 
$
161,346

 
$
(494
)
 
$
753,251

 
$
(26,414
)
 
$
914,597

 
$
(26,908
)
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:
 
March 31, 2015
 
December 31, 2014
 
Amortized
cost
 
Estimated
fair value
 
Amortized
cost
 
Estimated
fair value
 
(in thousands)
Single-issuer trust preferred securities
$
47,590

 
$
42,863

 
$
47,569

 
$
42,016

Subordinated debt
47,563

 
50,173

 
47,530

 
50,023

Pooled trust preferred securities
405

 
1,084

 
2,010

 
4,088

Corporate debt securities issued by financial institutions
95,558

 
94,120

 
97,109

 
96,127

Other corporate debt securities
3,562

 
3,562

 
1,907

 
1,907

Available for sale corporate debt securities
$
99,120

 
$
97,682

 
$
99,016

 
$
98,034