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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]  
Amortized cost and fair value for the major categories of held-to-maturity and available-for-sale securities
 
 
December 31, 2012
 
 
Amortized
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair
Value
Securities available-for-sale
 
 
 
 
 
 
 
Debt securities
 
 
 
 
 
 
 
 
U.S. states and political subdivisions
$
253,198

 
$
15,235

 
$
(229
)
 
$
268,204

 
Residential mortgage-backed securities:
 
 
 
 
 
 
 
 
U.S. government agencies
1,058,005

 
49,058

 
—

 
1,107,063

 
Commercial mortgage-backed securities:
 
 
 
 
 
 
 
 
U.S. government agencies
52,014

 
428

 
(406
)
 
52,036

 
Residential collateralized mortgage-backed securities:
 
 
 
 
 
 
 
 
U.S. government agencies
1,311,501

 
18,180

 
(260
)
 
1,329,421

 
Non-agency
11

 
—

 
—

 
11

 
Commercial collateralized mortgage-backed securities:
 
 
 
 
 
 
 
 
U.S. government agencies
109,260

 
2,221

 
(138
)
 
111,343

 
Corporate debt securities
61,541

 
—

 
(11,889
)
 
49,652

 
Total debt securities
2,845,530

 
85,122

 
(12,922
)
 
2,917,730

Marketable equity securities
3,241

 
—

 
—

 
3,241

 
Total securities available for sale
$
2,848,771

 
$
85,122

 
$
(12,922
)
 
$
2,920,971

Securities held-to-maturity
 
 
 
 
 
 
 
Debt securities
 
 
 
 
 
 
 
 
U.S. states and political subdivisions
$
270,005

 
$
5,126

 
$
(70
)
 
$
275,061

 
Commercial mortgage-backed securities:
 
 
 
 
 
 
 
 
U.S. government agencies
33,165

 
812

 
—

 
33,977

 
Residential collateralized mortgage-backed securities:
 
 
 
 
 
 
 
 
U.S. government agencies
123,563

 
533

 
(16
)
 
124,080

 
Commercial collateralized mortgage-backed securities:
 
 
 
 
 
 
 
 
U.S. government agencies
98,924

 
772

 
—

 
99,696

 
Corporate debt securities
96,464

 
1,521

 
—

 
97,985

 
Total securities held to maturity
$
622,121

 
$
8,764

 
$
(86
)
 
$
630,799


 
 
December 31, 2011
 
 
Amortized
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair
Value
Securities available-for-sale
 
 
 
 
 
 
 
Debt securities
 
 
 
 
 
 
 
 
U.S. government agency debentures
$
122,711

 
$
358

 
$
—

 
$
123,069

 
U.S. states and political subdivisions
334,916

 
22,865

 
(50
)
 
357,731

 
Residential mortgage-backed securities:
 
 
 
 
 
 
 
 
U.S. government agencies
1,407,345

 
53,129

 
(131
)
 
1,460,343

 
Residential collateralized mortgage-backed securities:
 
 
 
 
 
 
 
 
U.S. government agencies
1,115,832

 
22,058

 
(55
)
 
1,137,835

 
Non-agency
43,225

 
82

 
—

 
43,307

 
Commercial collateralized mortgage-backed securities:
 
 
 
 
 
 
 
 
   U.S. government agencies
127,624

 
1,648

 
(145
)
 
129,127

 
Corporate debt securities
115,947

 
276

 
(17,381
)
 
98,842

 
Total debt securities
3,267,600

 
100,416

 
(17,762
)
 
3,350,254

 
Marketable equity securities
3,299

 
—

 
—

 
3,299

 
Total securities available for sale
$
3,270,899

 
$
100,416

 
$
(17,762
)
 
$
3,353,553

Securities held-to-maturity
 
 
 
 
 
 
 
Debt securities
 
 
 
 
 
 
 
 
U.S. states and political subdivisions
$
82,764

 
$
2,348

 
$
—

 
$
85,112

 
Total securities held to maturity
$
82,764

 
$
2,348

 
$
—

 
$
85,112
Other investments
 
December 31,
 
2012
 
2011
FRB stock
$
21,045

 
$
21,003

FHLB stock
119,145

 
119,145

Other
527

 
578

Total other investments
$
140,717

 
$
140,726
Proceeds and gross unrealized gains and losses on sales of available-for-sale securities
 
Years Ended December 31,
 
2012
 
2011
 
2010
Proceeds
$
418,124

 
$
968,478

 
$
552,078

 
 
 
 
 
 
Realized gains
$
3,786

 
$
11,251

 
$
1,810

Realized losses
—

 
(170
)
 
(955
)
Net securities gains
$
3,786

 
$
11,081

 
$
855
Gross unrealized losses and fair value of securities
 
 
 
December 31, 2012
 
 
 
Less than 12 months
 
12 months or longer
 
Total
 
 
Fair Value
 
Unrealized
Losses
 
Number
Impaired
Securities
 
Fair Value
 
Unrealized
Losses
 
Number
Impaired
Securities
 
Fair Value
 
Unrealized
Losses
Securities available-for-sale
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Debt securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. states and political subdivisions
 
$
14,110

 
$
(229
)
 
24

 
$
—

 
$
—

 
—

 
$
14,110

 
$
(229
)
 
Residential mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government agencies
 
14

 
—

 
1

 
13

 
—

 
1

 
27

 
—

 
Commercial mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government agencies
 
31,237

 
(406
)
 
3

 
—

 
—

 
—

 
31,237

 
(406
)
 
Residential collateralized mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government agencies
 
133,008

 
(258
)
 
9

 
389

 
(2
)
 
1

 
133,397

 
(260
)
 
Non-agency
 
—

 
—

 
—

 
2

 
—

 
1

 
2

 
—

 
Commercial collateralized mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    U.S. government agencies
 
35,316

 
(138
)
 
4

 
—

 
—

 
—

 
35,316

 
(138
)
 
Corporate debt securities
 
—

 
—

 
—

 
49,652

 
(11,889
)
 
8

 
49,652

 
(11,889
)
 
Total available-for-sale securities
 
$
213,685

 
$
(1,031
)
 
41

 
$
50,056

 
$
(11,891
)
 
11

 
$
263,741

 
$
(12,922
)
Securities held-to-maturity
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Debt securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. states and political subdivisions
 
$
6,543

 
$
(70
)
 
12

 
$
—

 
$
—

 
—

 
$
6,543

 
$
(70
)
 
Residential collateralized mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government agencies
 
$
17,413

 
$
(16
)
 
1

 
$
—

 
$
—

 
—

 
$
17,413

 
$
(16
)
 
Total held-to-maturity securities
 
$
23,956

 
$
(86
)
 
13

 
$
—

 
$
—

 
—

 
$
23,956

 
$
(86
)

 
 
 
December 31, 2011
 
 
 
Less than 12 months
 
12 months or longer
 
Total
 
 
Fair Value
 
Unrealized
Losses
 
Number
Impaired
Securities
 
Fair Value
 
Unrealized
Losses
 
Number
Impaired
Securities
 
Fair Value
 
Unrealized
Losses
Securities available-for-sale
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Debt securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. states and political subdivisions
 
$
5,249

 
$
(50
)
 
$
6

 
$
—

 
$
—

 
$
—

 
$
5,249

 
$
(50
)
 
Residential mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government agencies
 
40,020

 
(129
)
 
4

 
149

 
(2
)
 
1

 
40,169

 
(131
)
 
Residential collateralized mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government agencies
 
48,003

 
(55
)
 
6

 
—

 
—

 
—

 
48,003

 
(55
)
 
Non-agency
 
—

 
—

 
—

 
2

 
—

 
1

 
2

 
—

 
Commercial collateralized mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    U.S. government agencies
 
30,227

 
(145
)
 
2

 
—

 
—

 
—

 
30,227

 
(145
)
 
Corporate debt securities
 
24,846

 
(127
)
 
8

 
44,234

 
(17,254
)
 
8

 
69,080

 
(17,381
)
 
Total temporarily impaired securities
 
$
148,345

 
$
(506
)
 
26

 
$
44,385

 
$
(17,256
)
 
10

 
$
192,730

 
(17,762
)
Contractual maturities and contractual yields of debt securities held-to-maturity and available-for-sale
 
 
U.S. states
and political
subdivisions
obligations
 
Residential
mortgage
backed
securities
U.S.
govt. agency
obligations
 
Commercial mortgage
backed
securities
U.S.
govt. agency
obligations
 
Residential
collateralized
mortgage
obligations -
U.S. govt.
agency
obligations
 
Residential
collateralized
mortgage
obligations -
non-U.S.
govt. agency
obligations
 
Commercial
collateralized
mortgage
obligations -
U.S. govt.
agency
obligations
 
Corporate
debt
securities
 
Total
 
Weighted
Average
Yield
Securities Available for Sale
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Remaining maturity:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One year or less
 
$
9,882

 
$
3,365

 
$
18,177

 
$
36,013

 
$
—

 
$
—

 
$
—

 
$
67,437

 
3.41
%
Over one year through five years
 
31,144

 
1,092,378

 
—

 
1,190,839

 
11

 
82,118

 
—

 
2,396,490

 
2.43
%
Over five years through ten years
 
174,772

 
11,320

 
33,859

 
102,569

 
—

 
29,225

 
—

 
351,745

 
3.43
%
Over ten years
 
52,406

 
—

 
—

 
—

 
—

 
—

 
49,652

 
102,058

 
2.51
%
Fair Value
 
$
268,204

 
$
1,107,063

 
$
52,036

 
$
1,329,421

 
$
11

 
$
111,343

 
$
49,652

 
$
2,917,730

 
2.58
%
Amortized Cost
 
$
253,198

 
$
1,058,005

 
$
52,014

 
$
1,311,501

 
$
11

 
$
109,260

 
$
61,541

 
$
2,845,530

 
 
Weighted-Average Yield
 
5.17
%
 
2.96
%
 
2.10
%
 
1.92
%
 
3.76
%
 
1.80
%
 
1.00
%
 
2.58
%
 
 
Weighted-Average Maturity
 
7.85

 
3.15

 
4.40

 
3.42

 
1.52

 
4.94

 
14.81

 
4.04

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Securities Held to Maturity
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Remaining maturity:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One year or less
 
$
49,247

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
49,247

 
1.68
%
Over one year through five years
 
13,841

 
—

 
—

 
124,080

 
—

 
31,671

 
34,827

 
204,419

 
2.31
%
Over five years through ten years
 
52,861

 
—

 
33,977

 
—

 
—

 
68,025

 
63,158

 
218,021

 
3.19
%
Over ten years
 
159,112

 
—

 
—

 
—

 
—

 
—

 
—

 
159,112

 
5.55
%
Fair Value
 
$
275,061

 
$
—

 
$
33,977

 
$
124,080

 
$
—

 
$
99,696

 
$
97,985

 
$
630,799

 
3.38
%
Amortized Cost
 
$
270,005

 
$
—

 
$
33,165

 
$
123,563

 
$
—

 
$
98,924

 
$
96,464

 
$
622,121

 
 
Weighted-Average Yield
 
5.51
%
 
—
%
 
1.86
%
 
2.04
%
 
—
%
 
2.91
%
 
2.20
%
 
3.38
%
 
 
Weighted-Average Maturity
 
13.27

 
—

 
5.92

 
2.60

 
—

 
6.61

 
5.04

 
7.13