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Securities Available for Sale - Summary of Securities Available for Sale (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]                
Reclassification adjustments for net gains realized in net income $ (129,000) $ 0 $ (129,000) $ 0        
Amortized Cost 1,817,265,000   1,817,265,000   $ 1,893,618,000      
Gross Unrealized Gains 20,358,000   20,358,000   3,010,000      
Gross Unrealized Losses (10,720,000)   (10,720,000)   (50,363,000)      
Estimated Fair Value 1,826,903,000   1,826,903,000   1,846,265,000      
Unrealized losses on securities (7,423,000) $ 45,122,000 (7,423,000) 45,122,000 32,705,000 $ 15,358,000 $ 38,640,000 $ 21,781,000
Available-for-sale Securities, Gross Realized Gains 527,000              
Available-for-sale Securities, Gross Realized Losses 398,000              
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax 32,000              
Proceeds from sale of securities available for sale     69,169,000 $ 0        
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01               (188,000)
Available-for-sale Securities                
Debt Securities, Available-for-sale [Line Items]                
Unrealized losses on securities (7,400,000)   (7,400,000)   32,700,000      
Retained earnings                
Debt Securities, Available-for-sale [Line Items]                
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01         (469,000)     $ (469,000)
Collateralized mortgage obligations                
Debt Securities, Available-for-sale [Line Items]                
Amortized Cost 842,576,000   842,576,000   914,710,000      
Gross Unrealized Gains 5,443,000   5,443,000   1,541,000      
Gross Unrealized Losses (3,120,000)   (3,120,000)   (21,129,000)      
Estimated Fair Value 844,899,000   844,899,000   895,122,000      
Residential                
Debt Securities, Available-for-sale [Line Items]                
Amortized Cost 369,476,000   369,476,000   415,659,000      
Gross Unrealized Gains 913,000   913,000   47,000      
Gross Unrealized Losses (3,213,000)   (3,213,000)   (13,101,000)      
Estimated Fair Value 367,176,000   367,176,000   402,605,000      
Proceeds from sale of securities available for sale     29,700,000          
Commercial                
Debt Securities, Available-for-sale [Line Items]                
Amortized Cost 530,206,000   530,206,000   481,081,000      
Gross Unrealized Gains 13,437,000   13,437,000   1,024,000      
Gross Unrealized Losses (2,712,000)   (2,712,000)   (12,979,000)      
Estimated Fair Value 540,931,000   540,931,000   469,126,000      
Corporate securities                
Debt Securities, Available-for-sale [Line Items]                
Amortized Cost 5,000,000   5,000,000   5,000,000      
Gross Unrealized Gains 0   0   0      
Gross Unrealized Losses (1,120,000)   (1,120,000)   (1,174,000)      
Estimated Fair Value 3,880,000   3,880,000   3,826,000      
Municipal securities                
Debt Securities, Available-for-sale [Line Items]                
Amortized Cost 70,007,000   70,007,000   77,168,000      
Gross Unrealized Gains 565,000   565,000   398,000      
Gross Unrealized Losses (555,000)   (555,000)   (1,980,000)      
Estimated Fair Value $ 70,017,000   70,017,000   $ 75,586,000      
Proceeds from sale of securities available for sale     $ 39,500,000          
Non-US Government and Agency Securities | Credit concentration risk | Stockholders' equity                
Debt Securities, Available-for-sale [Line Items]                
Maximum exposure to any single issuer     10.00%   10.00%