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Fair Values Of Assets And Liabilities (Narrative) (Detail) (USD $)
3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Jun. 30, 2013
Jun. 30, 2014
Municipal Bonds [Member]
Mar. 31, 2014
Municipal Bonds [Member]
Dec. 31, 2013
Municipal Bonds [Member]
Jun. 30, 2013
Municipal Bonds [Member]
Mar. 31, 2013
Municipal Bonds [Member]
Dec. 31, 2012
Municipal Bonds [Member]
Jun. 30, 2014
Equity Securities [Member]
Mar. 31, 2014
Equity Securities [Member]
Dec. 31, 2013
Equity Securities [Member]
Jun. 30, 2013
Equity Securities [Member]
Mar. 31, 2013
Equity Securities [Member]
Dec. 31, 2012
Equity Securities [Member]
Jun. 30, 2014
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2013
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2014
Fair Value, Measurements, Recurring [Member]
Municipal Bonds [Member]
Dec. 31, 2013
Fair Value, Measurements, Recurring [Member]
Municipal Bonds [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Municipal Bonds [Member]
Jun. 30, 2014
Fair Value, Measurements, Recurring [Member]
Equity Securities [Member]
Dec. 31, 2013
Fair Value, Measurements, Recurring [Member]
Equity Securities [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Equity Securities [Member]
Jun. 30, 2014
Fair Value, Measurements, Nonrecurring [Member]
Jun. 30, 2014
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2013
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2013
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2014
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Municipal Bonds [Member]
Dec. 31, 2013
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Municipal Bonds [Member]
Jun. 30, 2013
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Municipal Bonds [Member]
Jun. 30, 2014
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Equity Securities [Member]
Dec. 31, 2013
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Equity Securities [Member]
Jun. 30, 2013
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Equity Securities [Member]
Jun. 30, 2014
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Equity Securities [Member]
Minimum [Member]
Jun. 30, 2014
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Equity Securities [Member]
Maximum [Member]
Jun. 30, 2014
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Equity Securities [Member]
Weighted Average [Member]
Jun. 30, 2014
Level 3 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Jun. 30, 2014
Level 3 [Member]
Other Real Estate Owned [Member]
Fair Value, Measurements, Nonrecurring [Member]
Jun. 30, 2014
Level 3 [Member]
Other Real Estate Owned [Member]
Fair Value, Measurements, Nonrecurring [Member]
Minimum [Member]
Jun. 30, 2014
Level 3 [Member]
Other Real Estate Owned [Member]
Fair Value, Measurements, Nonrecurring [Member]
Maximum [Member]
Jun. 30, 2014
Estimate of Fair Value Measurement [Member]
Dec. 31, 2013
Estimate of Fair Value Measurement [Member]
Jun. 30, 2013
Estimate of Fair Value Measurement [Member]
Jun. 30, 2014
Valued Using Discounted Cash Flow Model [Member]
Jun. 30, 2014
Mortgage Servicing Rights [Member]
Mar. 31, 2014
Mortgage Servicing Rights [Member]
Dec. 31, 2013
Mortgage Servicing Rights [Member]
Jun. 30, 2013
Mortgage Servicing Rights [Member]
Mar. 31, 2013
Mortgage Servicing Rights [Member]
Dec. 31, 2012
Mortgage Servicing Rights [Member]
Jun. 30, 2014
Mortgage Servicing Rights [Member]
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2014
Mortgage Servicing Rights [Member]
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Minimum [Member]
Jun. 30, 2014
Mortgage Servicing Rights [Member]
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Maximum [Member]
Jun. 30, 2014
Mortgage Servicing Rights [Member]
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                                                                                                
Available-for-sale Securities $ 1,824,240,000   $ 2,176,290,000 $ 1,843,824,000 $ 176,107,000   $ 152,716,000 $ 150,127,000     $ 54,852,000   $ 51,528,000 $ 49,564,000           $ 176,107,000 $ 152,716,000 $ 150,127,000 $ 54,852,000 $ 51,528,000 $ 49,564,000         $ 38,053,000 $ 36,386,000 $ 32,432,000 $ 24,152,000 $ 22,163,000 $ 22,428,000                                          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value         38,053,000 39,772,000 36,386,000 32,432,000 32,324,000 30,770,000 24,152,000 23,438,000 22,163,000 22,428,000 24,470,000 22,169,000                                                             8,227,000 8,719,000 8,946,000 8,636,000 7,344,000 6,750,000        
Fair Value Inputs, Discount Rate                                                                       1.24% 2.10% 1.72%                               9.50% 13.00% 9.66%
Fair Value Of Mortgage Servicing Rights                                 8,227,000 8,946,000 8,636,000                 8,946,000 8,636,000                                               8,227,000      
Fair Value Inputs, Prepayment Rate                                                                                                           11.00% 16.00% 12.68%
Remaining contractual principal balance outstanding, mortgage loans held-for-sale                                                                                     340,500,000 314,900,000 539,500,000                      
Mortgage loans held-for-sale                                 363,627,000 332,485,000 525,027,000               0 0 0                                                      
Mortgages held for sale, past due 90 days and accruing   0 0 0                                                                                                        
Total impaired loans 137,245,000 [1]   162,229,000 [1] 190,148,000 [1]                                                                                   72,200,000                    
Impaired Loans Fair Value Disclosure                                                   65,046,000                         65,046,000                                  
Other real estate owned                                                   $ 115,584,000                         $ 115,584,000                                  
Fair Value Inputs, Property Specific Valuation Adjustment                                                                                 (40.00%) 55.00%                            
Level Three Fair Value Measurements Weighted Average Percentage                                                                 1.72%             (2.81%)                                
[1] Impaired loans are considered by the Company to be non-accrual loans, TDRs or loans with principal and/or interest at risk, even if the loan is current with all payments of principal and interest.