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Securities - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]            
Proceeds from sale of debt securities available for sale $ 49,600   $ 122,906 $ 0    
Gross losses from sale of securities 900   1,800      
Gross gains from sale of securities     300      
Gain (loss) on investment in shares of mutual funds (847) $ (48) (1,322) (198)    
Held to maturity, amortized cost 907,178   907,178     $ 882,872
Unrealized losses from securities transferred from available for sale to held to maturity     3,100      
Unamortized balance of securities transferred from available for sale to held to maturity 400   400      
Unrealized losses on mortgage backed securities of government sponsored entities 3,445   3,445     26,678
Fair value of securities in unrealized loss position 436,316   436,316     1,124,777
Federal Home Loan Bank and Federal Reserve stock recorded in other assets $ 33,000   $ 33,000      
Visa | Common Class B            
Debt Securities, Available-for-sale [Line Items]            
Shares of Visa stock held (in shares) 11,330   11,330      
Visa | Common Class A            
Debt Securities, Available-for-sale [Line Items]            
Conversion rate of Class A stock for each share of Class B stock (in dollars per share) $ 1.6228   $ 1.6228      
Shares issued (in shares)     18,386      
Accounting Standards Update 2017-12            
Debt Securities, Available-for-sale [Line Items]            
Held to maturity, amortized cost         $ 53,526  
Unrealized losses recorded in other comprehensive income         700  
CRA - Qualified Mutual Fund            
Debt Securities, Available-for-sale [Line Items]            
Gain (loss) on investment in shares of mutual funds $ 100 $ (100) $ 200 $ (200)    
Investment in mutual fund carried at fair value 6,400   6,400      
Public and Trust Deposits | Carrying Value            
Debt Securities, Available-for-sale [Line Items]            
Fair value of debt securities pledged as collateral 86,100   86,100      
Repurchase Agreement | Carrying Value | Mortgage-backed securities and collateralized mortgage obligations of U.S. government sponsored entities            
Debt Securities, Available-for-sale [Line Items]            
Fair value of debt securities pledged as collateral 99,881   99,881     246,829
Mortgage-backed securities and collateralized mortgage obligations of U.S. government sponsored entities            
Debt Securities, Available-for-sale [Line Items]            
Held to maturity, amortized cost 562,270   562,270     567,753
Unrealized losses on mortgage backed securities of government sponsored entities 2,025   2,025     21,371
Fair value of securities in unrealized loss position 198,684   198,684     823,604
Collateralized loan obligations            
Debt Securities, Available-for-sale [Line Items]            
Held to maturity, amortized cost 241,387   241,387     212,807
Unrealized losses on mortgage backed securities of government sponsored entities 1,402   1,402     4,319
Fair value of securities in unrealized loss position $ 229,184   $ 229,184     $ 238,894
Collateralized loan obligations | Accounting Standards Update 2017-12            
Debt Securities, Available-for-sale [Line Items]            
Held to maturity, amortized cost         $ 32,000