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Estimated Fair Values (Tables)
6 Months Ended
Jun. 30, 2019
Fair Value Disclosures [Abstract]  
Estimated Fair Values For Certain Financial Assets And Financial Liabilities
The table presents the carrying values and estimated fair values for financial instruments as of June 30, 2019 and December 31, 2018:
(Dollars in thousands)
June 30, 2019
 
December 31, 2018
Carrying value
 
Fair value
 
Carrying value
 
Fair value
Cash and due from banks
$
284,147

 
$
284,147

 
$
327,440

 
$
327,440

Overnight investments
1,640,264

 
1,640,264

 
797,406

 
797,406

Investment securities available for sale
4,366,041

 
4,366,041

 
4,557,110

 
4,557,110

Investment securities held to maturity
2,218,048

 
2,285,283

 
2,184,653

 
2,201,502

Investment in marketable equity securities
111,489

 
111,489

 
92,599

 
92,599

Loans held for sale
52,837

 
52,837

 
45,505

 
45,505

Net loans and leases
26,501,654

 
26,791,041

 
25,299,564

 
24,845,060

Income earned not collected
115,303

 
115,303

 
109,903

 
109,903

Federal Home Loan Bank stock
25,545

 
25,545

 
25,304

 
25,304

Mortgage and other servicing rights
22,809

 
25,129

 
24,066

 
27,435

Deposits
32,719,671

 
31,461,196

 
30,672,460

 
30,623,214

Securities sold under customer repurchase agreements
544,527

 
544,527

 
543,936

 
543,936

Federal Home Loan Bank borrowings
197,131

 
203,464

 
193,556

 
195,374

Subordinated debentures
154,277

 
166,374

 
140,741

 
151,670

Other borrowings
18,446

 
18,625

 
13,921

 
13,985

FDIC shared-loss payable
108,892

 
111,298

 
105,618

 
105,846

Accrued interest payable
14,197

 
14,197

 
3,712

 
3,712


Assets And Liabilities Carried At Fair Value On A Recurring Basis For assets and liabilities carried at fair value on a recurring basis, the following table provides fair value information as of June 30, 2019 and December 31, 2018:
 
June 30, 2019
 
 
 
Fair value measurements using:
(Dollars in thousands)
Fair value
 
Level 1 inputs
 
Level 2 inputs
 
Level 3 inputs
Assets measured at fair value
 
 
 
 
 
 
 
Investment securities available for sale
 
 
 
 
 
 
 
U.S. Treasury
$
948,402

 
$

 
$
948,402

 
$

Government agency
534,804

 

 
534,804

 

Mortgage-backed securities
2,733,698

 

 
2,733,698

 

Corporate bonds
149,137

 

 

 
149,137

Total investment securities available for sale
$
4,366,041

 
$

 
$
4,216,904

 
$
149,137

Marketable equity securities
$
111,489

 
$
24,991

 
$
86,498

 
$

Loans held for sale
$
52,837

 
$

 
$
52,837

 
$

 
 
 
 
 
 
 
 
 
December 31, 2018
 
 
 
Fair value measurements using:
 
Fair value
 
Level 1 inputs
 
Level 2 inputs
 
Level 3 inputs
Assets measured at fair value
 
 
 
 
 
 
 
Investment securities available for sale
 
 
 
 
 
 
 
U.S. Treasury
$
1,247,710

 
$

 
$
1,247,710

 
$

Government agency
256,835

 

 
256,835

 

Mortgage-backed securities
2,909,339

 

 
2,909,339

 

Corporate bonds
143,226

 

 

 
143,226

Total investment securities available for sale
$
4,557,110

 
$

 
$
4,413,884

 
$
143,226

Marketable equity securities
$
92,599

 
$
17,887

 
$
74,712

 
$

Loans held for sale
$
45,505

 
$

 
$
45,505

 
$


Fair Value of Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
The following tables summarize activity for Level 3 assets:
 
Six months ended June 30, 2019
(Dollars in thousands)
Corporate bonds
Balance at January 1, 2019
$
143,226

Amounts included in net income
82

Unrealized net gains included in other comprehensive income
1,838

Purchases
3,991

Balance at June 30, 2019
$
149,137

Fair Value Level 3 Significant Unobservable Input Assumptions
(Dollars in thousands)
 
 
 
June 30, 2019
Level 3 assets
 
Valuation technique
 
Significant unobservable input
 
Fair Value
Corporate bonds
 
Indicative bid provided by broker
 
Multiple factors, including but not limited to, current operations, financial condition, cash flows, and recently executed financing transactions related to the company
 
$
149,137


Fair Value Option
The following table summarizes the difference between the aggregate fair value and the aggregate unpaid principal balance for residential real estate originated for sale measured at fair value as of June 30, 2019 and December 31, 2018:
 
June 30, 2019
(Dollars in thousands)
Fair Value
 
Aggregate Unpaid Principal Balance
 
Difference
Originated loans held for sale
$
52,837

 
$
51,237

 
$
1,600

 
 
 
 
 
 
 
December 31, 2018
 
Fair Value
 
Aggregate Unpaid Principal Balance
 
Difference
Originated loans held for sale
$
45,505

 
$
44,073

 
$
1,432

No originated loans held for sale were 90 or more days past due or on nonaccrual status as of June 30, 2019 or December 31, 2018.
We may be required to measure certain financial assets at fair value on a nonrecurring basis. These adjustments to fair value usually result from the application of lower of amortized cost or fair value accounting or write-downs of individual assets due to impairment.
Impaired loans are deemed to be at fair value if an associated allowance or current period charge-off has been recorded. The value of impaired loans is determined by either collateral valuations or discounted present value of the expected cash flow calculations. Collateral values are determined using appraisals or other third-party value estimates of the subject property with discounts generally between 6% and 11% applied for estimated selling costs and other external factors that may impact the marketability of the property. Expected cash flows are determined using expected payment information at the individual loan level, discounted using the effective interest rate. The effective interest rate generally ranges between 2% and 18%.
OREO acquired or written down within the previous 12 months is deemed to be at fair value. Asset valuations are determined by using appraisals or other third-party value estimates of the subject property with discounts generally between 6% and 11% applied for estimated selling costs and other external factors that may impact the marketability of the property. Changes to the value of the assets between scheduled valuation dates are monitored through continued communication with brokers and monthly reviews by the asset manager assigned to each asset. If there are any significant changes in the market or the subject property, valuations are adjusted or new appraisals ordered to ensure the reported values reflect the most current information.
Assets And Liabilities Carried At Fair Value On A Nonrecurring Basis
For financial assets and liabilities carried at fair value on a nonrecurring basis, the following table provides fair value information as of June 30, 2019 and December 31, 2018:
 
June 30, 2019
 
 
 
Fair value measurements using:
(Dollars in thousands)
Fair value
 
Level 1 inputs
 
Level 2 inputs
 
Level 3 inputs
Impaired loans
$
120,783

 
$

 
$

 
$
120,783

Other real estate remeasured during the previous 12 months
20,079

 

 

 
20,079

 
 
 
 
 
 
 
 
 
December 31, 2018
 
 
 
Fair value measurements using:
 
Fair value
 
Level 1 inputs
 
Level 2 inputs
 
Level 3 inputs
Impaired loans
$
105,994

 
$

 
$

 
$
105,994

Other real estate remeasured during the previous 12 months
35,344

 

 

 
35,344