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Note Debt Securities Held-to-maturity (Amortized cost, gross unrealized gains and losses, approximate fair value, weighted average yield and contractual maturities of debt securities HTM) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 101,238 [1] $ 107,019 [2]
Gross Unrealized Gains 4,639 3,838
Gross Unrealized Losses 803 13,356
Fair value $ 105,074 [1] $ 97,501 [2]
Weighted Average Yield 3.65% 3.79%
Obligations of Puerto Rico, States and political subdivisions    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 89,121 $ 92,754
Gross Unrealized Gains 4,636 3,834
Gross Unrealized Losses 798 13,349
Fair value $ 92,959 $ 83,239
Weighted Average Yield 3.28% 3.38%
Obligations of Puerto Rico, States and political subdivisions | Within 1 year    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 3,510 $ 3,295
Gross Unrealized Gains 8 0
Gross Unrealized Losses 3 79
Fair value $ 3,515 $ 3,216
Weighted Average Yield 6.00% 5.96%
Obligations of Puerto Rico, States and political subdivisions | After 1 and within 5 years    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 16,505 $ 15,485
Gross Unrealized Gains 497 0
Gross Unrealized Losses 1 4,143
Fair value $ 17,001 $ 11,342
Weighted Average Yield 6.07% 6.05%
Obligations of Puerto Rico, States and political subdivisions | After 5 to 10 years    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 23,885 $ 29,240
Gross Unrealized Gains 1,127 0
Gross Unrealized Losses 575 8,905
Fair value $ 24,437 $ 20,335
Weighted Average Yield 3.61% 3.89%
Obligations of Puerto Rico, States and political subdivisions | After 10 years    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 45,221 $ 44,734
Gross Unrealized Gains 3,004 3,834
Gross Unrealized Losses 219 222
Fair value $ 48,006 $ 48,346
Weighted Average Yield 1.87% 1.93%
Collateralized Mortgage Obligations - Federal agencies    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 56 $ 67
Gross Unrealized Gains 3 4
Gross Unrealized Losses 0 0
Fair value $ 59 $ 71
Weighted Average Yield 5.45% 5.45%
Collateralized Mortgage Obligations - Federal agencies | After 5 to 10 years    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 56 $ 67
Gross Unrealized Gains 3 4
Gross Unrealized Losses 0 0
Fair value $ 59 $ 71
Weighted Average Yield 5.45% 5.45%
Trust preferred securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 11,561 $ 13,198
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair value $ 11,561 $ 13,198
Weighted Average Yield 6.51% 6.73%
Trust preferred securities | After 5 to 10 years    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost   $ 1,637
Gross Unrealized Gains   0
Gross Unrealized Losses   0
Fair value   $ 1,637
Weighted Average Yield   8.33%
Trust preferred securities | After 10 years    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 11,561 $ 11,561
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair value $ 11,561 $ 11,561
Weighted Average Yield 6.51% 6.51%
Other    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 500 $ 1,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 5 7
Fair value $ 495 $ 993
Weighted Average Yield 2.97% 2.47%
Other | Within 1 year    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost   $ 500
Gross Unrealized Gains   0
Gross Unrealized Losses   7
Fair value   $ 493
Weighted Average Yield   1.96%
Other | After 1 and within 5 years    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 500 $ 500
Gross Unrealized Gains 0 0
Gross Unrealized Losses 5 0
Fair value $ 495 $ 500
Weighted Average Yield 2.97% 2.97%
[1]
Includes $89.1 million pledged to secure public and trust deposits that the secured parties are not permitted to sell or repledge the collateral.
[2]
Includes $92.8 million pledged to secure public and trust deposits that the secured parties are not permitted to sell or repledge the collateral.